I have experienced this with two of my exes. It took me years to figure out that I'm attracted to people for different reasons, it's not always about how they look. I really value depth and intelligence in a person. Sometimes I'm strongly attracted to someone simply because they have a good sense of humor. Both of these exes were very happy, confident, outgoing and charming girls. One was very witty and funny; the other was pretty suave. I have to say, as soon as the relationship started to unravel, it suddenly became very noticeable to me how much I was not attracted to them physically. I'm probably a big asshole for feeling that way, but it's true.