I'm sorry but i would run a mile from this guy. He is clearly highly insecure and is taking out his issues on you which is making you feel insecure and worried about what he's doing whether you're around or not. No one can live with that kind of paranoia forever and i would put to you whether you've actually lost interest in him and are asking for advice as a way to feel better about not really wanting to be involved with him anymore either. There's nothing with that, and if you're questioning the relationship anyway that would be a signal to me that something clearly isn't right. Only you can decide what to do but i think there's just too many problems with this guy which a) he doesn't seem keen to work on and b) he doesn't want to share with you. We can't read this guy's mind but i would say his lack of interest in his own problems is an indication he isn't too concerned about your relationship or how the rest of his life will be affected. Either way it looks like you've dodged a bullet.