Most Helpful Guy
You said it yourself he's making you miserable. He clearly had an intent to cheat on you, whether or not he did doesn't matter as you can't confirm it either way. He wouldn't "mess around" if he cared for you. From your post you clearly care more about you two than he does, and it seems you aren't happy with the relationship. If I were you I'd just break up with him and let the healing begin. The fact he's not responding to you to clear it up shows he doesn't care enough. But ultimately it's your decision, that's just what I would do from what you've said. Sorry this happened to ya either way.
Most Helpful Girl
If he has an okcupid account it doesn't seem to be faithful to you and seems the be bored with it. I would break up with him