Confused and in denial

I'm been going over this problem in my head for nearly 3 months now. I recently lost a relationship over this so I'm free to figure this out. I don't want to be bi-sexual everything would be so much easier if I could just still believe I'm straight. I can't figure out what I am anymore it use to be so clear but its not anymore. I wish I didn't care or just ignore the problem but I can't. I've always looked at guys, had a few crushes, even just got out of the relationship with a guy whom I love very much or else I wouldn't have stayed for three years. But just like I look at guys I glance from time to time at girls too. I've never had any crushes on girls though except for one. She's a really good friend of mine and I can't stop thinking about her. She's into girls so that's not the problem I'm the problem because I can't get my head together and if I did have it together I still think I'm not good enough for her. Please someone help me try to make sense of it all cause I'm drowning.