Finding myself

I'm almost 16 and I've been in love once, with a guy who I dated for over a year. Once we broke up I realized I was bisexual. I always knew that I was, but I finally let myself admit it. The thing that sucks though is that I miss my ex but at the same time, I want my best friend, who is a girl. She is straight though and I don't want to say anything to jeopardize our friendship. I guess I just want some advice from outsiders. What should I do?