Tough call, not knowing every angle to this story.
But you know what? I'm all about giving people the benefit of the doubt.
But this opens you up to more vulnerability. By the way, I just got turned on to a counselor called Brene' Brown. Lots of YouTube vids so you can look her up. She's been on Oprah so she's GOTTA be good right?
Anyway, when you chose to be vulnerable like that it takes a LOT of guts. You could really get screwed here and not in a good way.
So I say, go for it. You're not being an idiot *IF* you know what you're risking. But I will say this, I wouldn't tolerate any B.S. from this guy. Either he's in it for real from now on (and you MUST make this perfectly clear) or he's just jerking you around.
Set out your needs/desires...
Describe your deal breakers...
Define the terms of your relationship NOW so everybody knows the rules and where the lines are drawn.
Otherwise you're just wandering around in the dark with someone rather than going down the same path.
Good luck.