I caught him creeping on my best friend.

My birthday was on the 28th of February and it was the worst day ever. Ended it in bed crying. The next day I was supposed to have plans that got canceled last minute, so I took myself out to enjoy a meal. My friend meets me afterwards and we go out for drinks. I went home to my partner, 28M, ready for snuggles and sex 🤷🏾‍♀️. A thing I usually do is I take pic for him 😉 to find in his phone the next morning. Except I go to take pics and I see photos of my best friend… Keep in mind it is the day after my birthday. He took photos of her boobs as she was coming into our apartment earlier that day. In other words…. He was creeping on her and sneaking photos of her body. I also found other pictures of other women in his phone. I was disgusted. I did and said things that I regret doing in that moment. He originally stated he doesn’t know why he did it. But, a few days ago he says it’s because I told him about a makeout session she and I had 8 years ago. I told him that while drunk during game night when we first started dating… So, like…. It’s my fault ?

Did I mention that our 5 year anniversary was a few days after my birthday…

But, I love this man so much. He’s the father of my child and I’ve never experienced anything like I have with him. But, I can’t even look at him. But, my heart is pulling in 2 different directions. Do I try to repair things or should I just flat out leave him ?

Update: I see everyone’s responses. I appreciate the feedback. This is the first time I’ve seen anything like this in his phone. I’m not sure if he’s been doing it for years or what. But I do know that I will not tolerate his disrespect. Please keep in mind this happened 8 days ago and I’m having a very hard time wrapping my head around any of it. Because WHAT THE FUDGE! Of course I am leaving. But I can’t just up and leave. I have to save you more money and find a place. I’m doing what’s best for myself and our child. It’s only up from here 😊✨

Also, I’m not sure how to tell her he did this. Any input ?