@gratzteach153,
Sounds as if you need to seek help love with trust issues so you can stand your own ground and not end up with the wrong type of guys.
Seems to me that you advised this guy of your trust issues and he lied to you or changed his mind about any promises given at the beginning of your relationship but that he wasn't the right one for you in any event. But also ask yourself of what you are asking of within a relationship, if it's practical and realistic.
If you are talking about cheating? Again, you've picked the wrong type. Have you tried Counselling to just discuss things out in the open with someone you "can" trust and obtain some advice on how to not get in this situation again?