help im straight? but im falling for my bi-sexual bestfriend

So, I've always appreciated other women, even went out of my way to watch some lesbian porn before.... But I've never had sexual thoughts about another woman. Always considered myself straight. Until this girl, I've been friends with her for under a year, I find her absolutely adorable, love being around her.... I've been reading other similar threads, but the difference is I actually have physical thoughts too. I found out she had a girlfriend a couple years ago and it excited me..... But when I really think about it I can't actually imagine being physical with her. Maybe its because I've never been with a girl?

Honestly I haven't had strong feelings for a man in years, I date em, get bored and tell them to get lost. But I think I want her. We live in different cities now, I only see her once a month but its the best part of my month. I think it might be for her too. I think she might like me too but she thinks im straight.... I'm so confused!?! I don't want to ruin our friendship, how do I know if this is real? I almost feel like I should hook up with a chick just to see if I like it.... Any advice is appreciated!

 

I'm sure she would be, I just worry about how it would change the relationship. You're right though, life is too short, I just can't imagine after all these years of liking men, that i'd have the potential to fall in love with a woman. Hate to ruin a friendship if this is just a phase.