What do I do?

So I just found out recently that I am about 7 weeks pregnant. My SO has been very distant ever since and he has cheated on me before. So being the FBI agent I have become over the last year, I found out he had been downloading dating apps again a few weeks prior. Along with adding random females to his social media platforms. After bringing it to his attention over and over I just get called crazy for going through his phone but if I don’t I never get the truth. He said he is allowed to look and changed all his passwords again.

I’m just at a loss for what to do, if I can’t trust him to treat me right how the hell can I expect him to treat our kid right? I was so excited to be a mom but now it’s been shattered by doubt. I ultimately want to give him the chance to do better for our kid but he hasn’t done any good with the chances I’ve given out so far.

What’s most important is what’s best for the kid but truly don’t know what that is. Any advice or insight would be much appreciated ❤️