FWB (21M) of six months is ending the benefits part of our dynamic with me (21F) but is continuing to have casual sex with other women

Been getting with this guy for six months. Never had any conversations at all about boundaries, etc (which is retrospect was probably a mistake). Assumed it was just casual and chill and didn't think much into it. We were friends beforehand for two years and got to become pretty close friends throughout the past few months bc we would text/call etc all the time. He's always been the type to be in a relationship, and he told me at the beginning of our fling that he wants a gf/does best in a relationship/etc. He told me last week he can no longer have sex with me but that he wants to still be friends/sleepover/etc, and that he REALLY wants a gf at this point. However, for some reason he felt the need to mention that he will probably get with girls over spring break, etc. It's not so much the end of this dynamic which is throwing me off, but the fact that he felt the need to mention to me that he is fine with having casual sex with other women (while he was laying in my bed lol). If he can have one night stands, why not just keep getting with me lol! I asked him to clarify if that meant that he wants to be "done" with me/this and he got upset about that so I was pretty confused. I am fully happy to move on, but I was pretty good friends with him beforehand and throughout this so I want to do right by our old friendship is nothing else and not just "give up" if there's something he's trying to say that I'm missing.

I don't want to be "hard to get rid of" lol, so my question is how do I do right by my old friendship with him while also keeping my self respect and not seeming like I can't let this go. It is hard to lose a friend, but I think I should've considered that before I climbed into bed with him probably. I also don't want to just throw in the towel prematurely, and I think I have not been the easiest person to be involved in, so if this is his way of testing my feelings, then I need to speak up.

tl;dr fwb of six months wont have casual sex with me anymore but will with other women