Why do I fall for dickboys

There's a really really good guy who I'm talking to and going out with. Good looking, selfless, sweet, my friends love him. And there's another guy who I'm sleeping with. He has children and (PLEASE don't judge it's complicated) is in a relationship, and isn't as good looking or nice as the other guy. Why the FUCK am I attracted to the bad guy always 😭😭 Im so horny for him all the time. He said he has feelings and now I'm so confused HELP