Does anybody else tend to lose interest as soon as the feeling becomes mutual?

I've been wondering how many people feel this way as well.

I might find a woman incredibly attractive, but she'll immediately become repulsive to me the very moment she starts expressing serious interest in me. And by "repulsive", I actually mean she starts to look ugly to me to the point I'd avoid looking at her in person.

I don't know exactly why this happens, but it's a long-term pattern I have.