OK, so, you’re super happy together now, and your problem is that you weren’t this super happy together earlier? Like… that’s the issue?

It seems to me that the issue might rather be misplaced guilt (on your part), magical thinking (we have to go back in time to fix the past!) an inappropriate virginity complex on his side (he can’t feel special unless he’s the “first”? wtf?) and, most importantly, his seething, all-consuming resentment that you were not his girlfriend, which somehow survives despite the fact he’s set to marry you.

Like others have in this thread, I would advise against marrying him. The basis of this relationship seems to be guilt, resentment and jealousy. That’s no basis for happiness, girl. Treat yourself better than that.

I’m sorry that’s not the advice you wanted.