Loving someone and being compatible with them are very different things, Jan. The 'love' part comes from you and says you are a good person. It has nothing to do with how good the two of you are together. Dysfunctional couples who divorce often say they love each other. Doesn't make those atrocious marriages any better. I would move on if I were you.
As for ever knowing the truth: that's the paradox. If he was the kind of person who could be honest with you, then you wouldn't be having this problem in the first place. Sometimes, all you can do is close your mind to 'what might have been' and move on. Good luck, Jan.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh