Hello, will I get married, and welcome to Psych Central! I can't say I totally understand what your story is, but I don't think there is any way you can "prove" to him that what you said is true, unless these guys are polled and they tell him there was no sex. I'm not sure that could be done.....

So, were these guys you kept in touch with actual previous boyfriends? Is that what you are saying?

What did you actually lie about to him? What did you say? And then what did you later say was the truth?

I can see why he would be distrustful of you since you did lie to him. And trust is important in a lasting relationship.