BF friends with women he’s had sex with

Hi all. Posted in here before about a similar topic. I’m 26 and he’s 27. Been dating for a year. He’s friends with a lot of women – platonic and others were not so platonic. I told him months ago I don’t want to know which friends he has that are women that he has slept with. He’s had one friend, let’s call C, who they get dinner and go out about once a month. They go shopping together sometimes and he has helped her pick out clothes. I have never once questioned this from him. Last night, I finally met her at a dinner (it was the 3 of us). She was nervous to meet me and excited to meet me. I liked her and got overall good vibes. He knew her since HS but reconnected in the city off of Tinder, which he told me after the dinner.

At his apartment, I asked him if him and C had any prior romantic connection (my mind got the best of me) and he was open and told me they hooked up a few times in 2021 after reconnecting. He told me it was meaningless sex and out of “convenience.” They both realized it wasn’t working and they were better off as friends. I suddenly felt nauseous and wanted to go for a walk alone but realized that would have freaked him out. We had a 3 hour discussion about this and I finally came clean on how I have felt with his other women friendships – that I feel like I’m not enough emotionally for him and I feel like he actively keeps in touch with women he’s had prior sexual relationships with because I’m not supplying him with something. I made it clear I’m not mad about his past and or her, but I don’t have any guys in my life who he would meet that I have had sex with because I have had clearer boundaries. This is entirely an insecurity of mine. I felt platonic vibes and do not feel threatened or concerned there’s feelings (he has since met her many other boyfriends since they hooked up). I purely just don’t understand why he wants to keep hanging out with, texting women he’s had sexual relationships with. I don’t get it.

We are moving in together this week on top of this. We signed a lease and are starting a new step together. I am not sure how to react to all of this. I’m upset and I wish he wasn’t hanging out with these girls still one on one – I don’t know what value they add to his life. As we move in together too, I want to tell him the one clear boundary I have is that they don’t hang out one on one in our shared apartment. That’s one space where I feel safe and I work from home. I’m young and this is all new to me in many ways. I’m looking for advice and guidance from older women who have been through this. I want to make it clear I’m not upset at all he has a past – more so that he texts and hangs out with (and wants to introduce me) to women he’s has had sex with. I love him so much and I worry this will eat at me, until I know the others. I don’t want this ruining our relationship because everything else is so good and special.