should I give him another chance

SierruhhMarie
My baby daddy and I have been off and on from he start. Our relationship is toxic. Literally. He's emotionally unstable and I'm completely crazy when we are together. He says he wants a relationship with me again but I left him 2 years ago because he acted like he DIDNT want a relationship. He's been trying hard to get his life together, he's actually kept the job he has now for a good while. He's trying to get a car and eventually his own place. 
But I really just don't think he and I could ever actually be happy in a relationship together. Yes I love him, and I don't ever want to see him with someone else but I just can't put myself through that. Ive come so far from where I was with him ohysically, emotionally and mentally. But then I get mad or overly jealous when I see some bitch comment on his stuff or something. Like what's wrong with me.