My partner wants to be with other people

UPDATE: Thank you for all your advice and care and concern. I appreciate input from both the poly and ENM community as well as those who practice monogamy. I think either way the advice is pretty consistent. I’m taking time to digest and will take things from there.

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I’m 37f and 6m postpartum. Over the past year and a bit my partner 40m has started dabbling more with recreational drugs and going to festivals. Upon going to Afrikaburn for the first time just before I gave birth he decided that he could love multiple women and has been hinting strongly at opening up our relationship and has expressed his desire for ‘novelty’

Before the baby I could intellectually get my head around the need for novelty and opening up a relationship with some boundaries. But postpartum I’m finding the idea incredibly triggering.

He has also told me that he wants to pursue female friendships that are intimate and loving but not necessarily sexual. This I hate idea.

I’m trying to find if there is actually anything sacred left for us if his will plays out. I don’t want to be with other men. I want to be with him. I don’t feel the need to have intimate friendships with men.

I need 30+ female wisdom. I’m not naive to the fact that long term relationships may require nuance and creativity and space. But sheesh this just feels like a lot and I’m feeling quite sorry for myself in all this. Like I’ll be the loser in the end.

Is there a healthy way to navigate this?