Why do I always get crushes on girls who are aready taken?

Im always getting crushes on girls who are taken. Either I grow a crush on a girl who is already taken, or I get a crush on someone who WILL get taken. I grew a crush on a girl who has been my best friend for three years, But shes taken!!! That was the...

first time...nowadays me and my best friend don't talk anymore because her boyfriend dosent like me talking to her. Recently I grew a crush on a girl who thought that liked me, I mean, we have been close recently (physicaly) shes always holding my hand and and hugging, sittung, and laying down on me, this has gone on for two weeks. and I was going to ask her out, but now she got a boyfriend which falls to my question again...Why do I always fall for the girls who are taken???

maybe you should have asked her out while all that was happening...then maybe she would have been taken by you