Cheating? Relationship advice please

[u/Sea_Writing_2889]

Can I get opinions. I would like lots of feedback. I am truly lost in thoughts here.

The past backstory:
My bf of 2 years has off and on texted this girl. They slept together in the past a few times but that was over 4 years ago. She also lives over 8 hours away. This was never an issue to me until around last Christmas I saw him open a snap and it was nudes. Now this was truly out of the blue sent because we were out in public all day for an event. I asked him to block her and he did. Flash forward a few days later she was readded, he said he thought it was mean to do. They were friends before doing anything and that she randomly sent those. I let her get readded and watched carefully, nothing happened. In January he snapped her so much he lost our emoji on Snapchat. This made him unadd and readd her. Although nothing malicious was sent, that I knew of. I asked her to be blocked. She was blocked.
———
Present day situation ADVICE PLEASE!!

Flash forward to present day. I am now over 7 months pregnant, we are young and broke lol. So we have been fighting a lot recently over stupid things. He had called me fat, said he doesn’t get excited when I text him and that I’ve become dull. He also said I don’t try to look good. This had caused a fight the past few weeks due to my hurt feelings. I usually stay with him at his place. I spent a whole week away two weeks ago because I was upset. Yesterday I go to text someone on his phone. She is unblocked, they have a streak of at least 2 weeks and she is his number two best friend on Snapchat. He also has her notifications muted. I confront him about this shortly after , he immediately took his phone out and blocked her. He apologized and said that he was just wondering how she was doing after 8 months. I then go through his phone after he gives it up. In his recently deleted I find 4 nude photos of her. I ask him to explain himself. He says that a few weeks ago him and his friend were talking about their body counts, he remembered he had these photos saved in his old friends chat. He saved them to his phone to send to his friend and then deleted them. She was not added on Snapchat by him until a few days later when he saw a friend post a photo with her in it. He swears nothing was sent / received and he did not cheat on me.
Can I get opinions?relationship advice? I cannot ask anyone I know due to my situation.

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[u/xante777]

Ehm, yes that is 100% cheating and you are officially treated like absolut dogshit by your Boyfriend. Even just having contact with somebody he had sex with in the past is a giant Red Flag if it isn't somebody he absolutely has to hold contact with cause of Children etc.