My husband still talks to his ex

This is gonna be a long story so bear with me please and I hope the comments are not harsh on me or my husband.

So my husband and I has been married for 11 months now, we have been in a relationship before we got married for about 9 months. I am 33 and he is 32

When we got to know each other he introduced me to all his friends except one of them and the reason was that she is not very social, she is extremely introvert but she is an important person in his life and we will get to know each other in the right time.

Before introducing me to her he told me to be very considerate of my actions and words infront of her because she still doesn't know we are in relationship and he wants it to come from him first to avoid "shocking" her that we are about to get married in 2 months, and yes he introduced her to me when we decided to get married, because everything came fast we didn't plan to marry this early but I got a job in another country and we had to decide getting married so he can get also residence permit as family and live with me.

After meeting the girl she was really nice and over sensitive so I understood and trusted my husband's judgment ( my boyfriend at the time) and I was trying to be as nice to her as possible. However I was still not feeling totally comfortable with how they are close. They can talk for an hour on the phone. She stays sometimes at his family's house and sleeps in his bedroom. And they text almost daily. I talked to him about that and it doesn't make me comfortable and he told me toconsider her as his sister because literally she is a sister to him so no need to be jealous.

A few months later after we moved to the new country we had a fight me and my husband about something I don't remember but somehow it brought up the topic that my husband and this girl has been in a relationship before for like a month or something and that was very long time ago in 2017 or 2018. I was not happy about it but he promised me it means nothing now and they are both truly friends nothing else and I believed him. But still not very comfortable I was just trying to be the smart wife that doesn't have her insecurities or jealousy be all over the place.

1 months ago, I went back to my home country without my husband to visit my family and his. I didn't start the conversation with his Mom about this girl because I don't know how much she knows about my husband's detailed life. But she was the one to open the topic for me ( his mother) and she told me she doesn't like this girl and since my husband left the country she has never visited them like she used to do. Not only his Mother but my husband's cousin and sister also confirmed that some of her actions were fishy and they felt it shows little respect for me. Forgot to mention that she didn't come to our wedding because she had flu.

When I came back from my vacation I was planning not to talk to him about this but I had a lot of thoughts until I saw some pictures on his phone while he was showing me the gallery, the pictures were for him and her taking screenshots from a video call and she was wearing something very revealing not like she dresses in public. So technically speaking she didn't do anything wrong because according to his story we are friends or brother and sister.. But it made me very angry but I showed nothing to him.

later he forgot his phone at home, I am not proud of it but I would do it again. I searched his phone whatsapp for any word related to my name in their chat. And here is what I found:

Once the girl knew we are getting married, she kept telling him not to marry me and he shouldn't trust me and not to worry about me being sad after breakup, she thinks because I spent my life in casual relations before him that I would never commit to him and her words were not said in a good way she was litterally calling me a bitch and she told him how can you love someone after me while you told me you will never love again"

The second fact is that they didn't end the relationship far ago. It was ended in 2019 and they kept on and off for another year and that got me curious so I checked other messages too. So he kept having feelings for her until 2021 and in 2022 when he was about to get in a relationship with a girl before me and she did the same and kept fighting with him for not telling her early enough and accused him of forgetting about her.

I couldn't face him with what I saw because of course that was wrong but I opened the topic with him and as the conversation went on he suggested to show me the whatsapp messages because I told him I don't trust her so that was my chance to at least show him some of what I saw. So because I know exactly what I am looking for I got the part where she told him to not get married, he explained this by saying yes she is not usually stable she has no one but me ( because she is an orphan and really she has no one in life not even friends no family) so maybe she was pissed because he is her only friend, and he told me that they had a phone call later and he explained to her everything and she changed her mind about me later and I shouldn't judge a person upon the first reaction and it was only this time she never bad mouthed me again. He asked me what satisfys me and I told him that I don't want to talk to her again ( I was trying to be her friend at the beginning and helped her with a lot of things) and he should minimize talking to her because I feel her intentions are not so pure and maybe you don't love her but she seems to be still loving you or at least she just wants you by her side. He didn't agree or disagree with my thoughts and feelings but he told me he will do what I want. But of course I couldn't face him with all what I saw and to be honest the part we didn't discuss is the worst since it is related to how he lied to me over the past months about the nature of their relationship.

My question is: what should I do? this is really eating me alife and I want to fight him for lying to me about the duration and the ending of their relationship, I want to face him with her words that obviously means she is in love with him and I want to tell him to cut her off but I am afraid that would break his trust in me because how else I can face him without telling him I opened his phone and I really don't want to be harsh on the girl and cut her off from the only person in the world she has I don't want to be that kind of wife that gives orders to her husband.