I think the fact he was willing to share his history with you should tell you something. It takes a lot of trust to admit that I think. Try to focus on that. Insecurities about the past have ruined multitudes of pairings. If you love him, live in the present.

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As to marriage or celibacy, let a man take which course he will. He will be sure to repent - Socrates

Love is not looking in each other's eyes, but looking together in the same direction - Antoine De Saint-Exupery