Do you know someone who's either never had a relationship who can't keep a partner and you're honestly surprised?

I’d like to present a foil to this question which is about people who can’t understand why they’re single despite an obvious reason.

So, Jellies, are you baffled by someone’s continued single-hood? I recently met a guy who has never had a girlfriend and I cannot for the life of me understand why. I asked him about it and he claimed that he just always falls for the wrong girl. At first, I thought that perhaps it was because he was a hardcore geek, which is possible, I suppose, but he is one of those who we in the geek world say can “pass” for normal on the outside. He’s a good-looking guy, very friendly and personable, funny, kind and has good social skills unlike most of us geeks :P yet he has never had a girlfriend. I am truly baffled.

So, Jellies, do you know anyone like that? Have you ever talked to them about it? What did they have to say about it?