What is so wrong with me???

I want all of this going on in my relationship with my fiance to be resolved.I hate having problems and not knowing how to fix it and it doesn't help when he isn't saying much to me.I feel worthless and that i should get out of.But what if it is all me then what?I know that he has been lying to me i have the proof and yet he still denies and tells me it is just me trying to start something.He has been apparently talking to me.If you don;t want me don't stay that is how i feel about it.If you arent happy dont stay with spmeone just because of the situation you might be in.I just at a stand still dont know what to do........