How could it go wrong so quickly? Who knows? There are probably a thousand answers, and they are probably all equally right and wrong. You'll just burn perfectly good brain cells trying to figure it out. Maybe he wasn't ready? Maybe he is a "chaser", doesn't know what to do once he has "caught"? I don't know. But I can't imagine it's you. I only know a little about you, but I just don't see that.
Rest. We'll plan a rafting adventure. You'll detach. And time will tell.