unEXpected situation

So, I just want to start out with saying I love my fiance with everything that I have and, I would never do anything to hurt our relationship or him... recently, my ex messaged me. he wasn't ever a bad guy and he was someone that I could see myself with but, because he was so afraid of me ending things, he always picked fights with me... he and I were happy when we were together but, I decided never to get back with him because of the arguments. he keeps mentioning how great I am and how happy he was when we were together (he suffers from severe depression so, that wasn't common for him)... I wish there was a way that I could combine these two men because I would have my perfect man... My fiance loved me and I love him but, he has looked up women on FB and at the start of our relationship, he was messaging other women. it is hard for me to trust everything he says but, he is an amazing man other than thay... he treats me good, we don't fight or yell at each other, and he is an all around great guy. I'm torn because the trust issues that I have with my fiance cause me to want to run back to my ex but, the fights my ex would cause make me want to have nothing to do with him. My fiance is aware that my ex and I are friends and, I let him read everything that is discussed... I do not hide anything from him and wouldn't. but I guess what I'm asking is, has anyone else ever felt this way where you were torn between two men in a way??? please no judgements I'm just needing some advice...