AITA for going through my boyfriend’s phone

My boyfriend (25m) and I (25f) just had a baby 7 weeks ago and all throughout my pregnancy up to this point I felt like something was off and he was talking to someone else. I have never gone through his phone but 3 days ago I felt like I needed to go through his phone and what I found honestly disgusted and devastated me. I know I shouldn’t of went through it, it was an invasion of privacy but I had to know and I found naked photos of my best friend from when I was 6 months pregnant of just her that he had screened shot… he also had hundreds of photos of naked girls and a bunch of his ex and them fucking. I asked my best friend about the photos and she said she never sent any which I believed. Anyways 3 days later I finally found the guts to ask him about it and he said he didn’t want to talk about it so I waited another 7 hours and brought it up again and he was more willing to break up then to talk about it but I convinced him because we clearly have a kid together and we don’t want to through it away. He said he logged into her Snapchat which I don’t know how he did and he went through 100s of her photos Because the photos he had saved go back to 2020. He said he feels guilty when he thinks about him doing it but i don’t think he would of felt guilty if I never found out because it’s been months. I feel like I’ve been cheated on and I can’t forgive him. When I was pregnant we didn’t sleep in the same room until I was 7-8 months pregnant because we had a queen sized bed and I would get hot and needed space and he blamed us not sleeping in the same bed for him saving the photos. Like I’m so incredibly disgusted and feel like I’ve been cheated on I don’t know what to do and I’m so hurt. We said we should go to therapy but I don’t think I can ever trust him again all I can think about is him looking at other girls. Like I gained a lot of weight in my pregnancy and I know I’m not his type he never compliments me and the only time we ever have sex is when we both have had a couple of drinks. Anyways I’m not sure if that makes me the asshole for going through his phone I know it wasn’t okay but aita?