AIO for being sad?

Alright, so I (F31) was seeing this guy (M29) for a couple of months and we were keeping things casual as I'm going through a divorce and we live a few hours from each other. Recently, we ended things, and I was feeling sad about it because I ended up catching some feelings (I thought he had too). I made some posts on my close friends Instagram stories that were memes about being sad, and he messaged me asking me to stop because it felt like I was guilting him. I stopped, but then he was still mad that i was even upset about it and that I said he was giving me mixed signals. He said that we weren't ever doing anything more than flirting, and I was ignoring his boundaries.

I feel confused because there were quite a few times where it felt like he was doing more than just flirting. He wanted to watch a movie and talk on the phone every other day, he didn't want me spending time with someone I had history with, when I asked how it was going with snapchat girls, he asked if i wanted him to stop talking to them and when I told him that I was going to visit him, he said he wanted to take me on a date.

Apparently all of these things were just flirting and I was wrong to put any meaning behind it. I wasn't in love with him, but I was enjoying our time together and could see the possibility of it being more sometime in the future. Am I overreacting by being sad about things ending and saying that he was giving me mixed signals? I would love any sort of clarity on this weird hot mess.

Texts are from before we ended things and IG messages are from after (for some reason he switched even though we have always texted?)

TL;DR: the guy i was involved with says I'm overreacting by saying he was giving mixed signals