Bisexuality Support Group
Bisexuality is a sexual orientation which refers to the aesthetic, romantic, and/or sexual attraction of individuals to other individuals of both their own and the opposite gender or sex. Most bisexuals are not equally attracted to men and women, and may even shift between states of finding either sex exclusively attractive over the course of time.
Just because you are interested in a relationship with other women doesn't mean that she is, and you need to realize that that's okay. Try and distance yourself from her and move on, because if you persist in chasing her when she's made it clear that she's not interested in anything more than friendship you run the risk of losing her altogether.
I know it can be hard when you are in love with someone who doesn't return those feelings, but understand that she is correct, you will eventually get over her and find someone who is better suited to you. Doesn't mean it will be any easier, but this is the reality of the situation. We can't always get what we want and to try and force it will only ruin what you may have.