Did people really overwhelmingly say he was an abusive asshole? And if so which subreddit was this? Yeah, he did something to spite you because he was insecure about you seeing another woman that you were not only having sex with but had strong emotional feelings for and you telling him you may he a lesbian seemed to trigger a fear of you leaving him but I don't really see that as psychopathic behaviour. Is he jealous? Sure insecure? Definitely immature? Yes but I am not seeing a psychopath from that post. I mean the same feelings you felt seeing him with another woman, he felt all the time you were with Christina especially after you said you may leave him for her.

Edit: I will admit that him talking you out of your last relationship to be with him at the beginning was problematic and doesn't really make him seem like a great guy.

You two need to work on your issues because even if you break up at this point, you have a child to worry about now.