His EX. should I leave ?

I been with a guy now for 6 months , we have a lot of problems and he cheated back in April . This might be a long story so I apologize but I’ll try to make it short. My point here is . Am I overreacting ? And should I finally be done.

3 months into our relationship I found a vault on his new phone he got with me , of girls nudes and my nudes. It was a calculator app. I stayed

2 days later I see him republishing a pic twice of the same girls tits, I assume getting her attention.

We break up. During that day. That night he wanted to talk, I talk. We get back sorta on ok terms. And for the next 3 days he was calling and messaging his ex. The min he wake up from work, to dropping me off after seeing him for work. And also during one of these days , we brought a pregnancy test cause we were scared and he messaged her that same day after I took it.

Here’s what I’m trying to get at. He told me they talked about a concert coming up in etown. She lives far away and she’s flying up here to go to the concert, and he asked me to go, before I even knew she was going or he even knew . Sense he talked to her behind my back. His ex. Of 3 years. Anyways etown is 5 hours away from where I live. And I said idk about the concert before I even found out she was gunna be there. Fast forward. I find out what we talk about, I constantly worry and bring it up so he let it all out.

After I find out a couple days later he asks me if I wanna go again. And I just get upset and he “ Don’t understand” why I don’t wanna go but like ???? Am I over reacting . Like I’m really upset about this and even from before. It’s killing me being with him sense that. Help please...