Eliz, its not so much doubt though than just wondering if agreeing to be engaged with him was a good idea. For example if your investing your money or life into a decision you want to make sure it's a good idea. You might want to make that decision and it makes you happy now but you just want to ask a friend, counselor or whatever who is more knowledgeable on your decision if it is a good call or not...
I just sometimes wish he'd stop saying things that upset me, its emotionally draining. Other than that I know he's a good guy who cares about me, if I could just get him to start thinking before he blurts out stuff...