She is my best friend, she loves me and i love her.Yet she has a boyfriend and before that really bothered me, but i realized that we both love each other and really thats all i need from her, nothing more.
But there are these other girls that i am perhaps giving the wrong impression to. I really want a relationship but im afraid of betraying or of not being there for the girl i love when she could really need me. Besides that i have really no more interest in any of the other girls xcept for friendship and even then at times not even that, which makes me feel like a selfish bastard. -yes i have a heart-
What should i do, both for me and for them?
This does not mean that you are required to be there in case she ever needs you. You are entitled to your own happiness.
Go out, find some girl who you can actually be in a relationship with.
Be happy. Stay friends with this chick, but if she has a boyfriend, there's no reason to hang on to this "I love her" type thing.