Your bf is being honest and he seems really sweet. I assume you just started a relationship and you may seem shocked because he is putting it all on the table, but that's good. I hate surprises/secrets especially later on. My then BF lost his at 14 yikes. But I appreciate him being honest and not hiding anything out of shame. Yes I admit it I felt shocked at first, but it's normal. Honestly I don't care anymore at this point, he's done it before he even met me.