I found out my bf (30m) cheated on me (25m) and he is playing the victim

I found out my bf (30m) was cheating on me (25f) from the “Are we dating the same guy page” after I posted him on there. I only did this because the other day he went through my phone with no issue but when I tried to grab his he said no and snatched it up and it didn’t sit right with me, because I have had to worry about him cheating on me once before. I genuinely thought he was doing better for me but after I posted that a girl reached out to me saying they were talking about a year and a half off an on and the last time they had sex was 8 months ago. I just told him the information I knew but never told him who it was or how I found out. I stopped talking to him for a few days and starting ignoring his calls and texts. I do feel kind of bad because he would come to my house and want to talk and he would come when it was snowing outside and I would just tell him I don’t want to talk. He told the manager from his job sent him the post that I made in that group. He basically has been playing the victim and making it seem as if he can’t trust me because I posted him in that group. He claims it was just “head” he got from the girl so I guess to him that makes it acceptable. He does do a lot for me as far as making sure I’m okay financially , making sure I eat everyday and buying me things he makes sure to bring up everything he does for me when we argue. He says that he doesn’t want to do that for me anymore and he doesn’t look at me the same for posting him on that page. It’s like he made it seem like everything was my fault or not deserving of anything he does for me and acting as if he is the one who doesn’t want me anymore after he cheated. Thoughts? Advice ?

TL;DR found out my bf was cheating on me from a group on Facebook now he’s playing the victim and acting as if he is the one discarding me.