Painful Doubts

This painful doubt is back. Am I so sure I want to go through another relationship and give it my all but have more wrong with me? I'm not use to distance apart but I know it's good for us for the space. Should I walk away from this good man over one thing that I can learn to overcome this whole thing. Distance away does worry me about many many things. Could he have another girl where he is? I bet it could be someone way prettier or someone that doesn't have painful pasts. I bet this girl he has will be way more beautiful in this life to understand him and his social needs better.But then I feel like not knowing if he does or doesn't is killing me. Inside I've finally learned to deal with all this loss and learned better than I have. I could miss them but aye it's more about this man. I don't know if he is cheating on me or not. It scares me honestly.