First, I'm not a big fan of labels. I don't think it matters if you are bi or lesbian. Perhaps the only use would be to deter men from bothering you.
That being said, let's take this to an extreme. Sometime has a sexual relationship in high school with someone of the opposite sex. Then, for the next forty years dates only same sex and is only attracted to the same sex. Is that person bi or gay. I suspect most people would say gay only, not bi.
I make this point because what you are and what you were don't have to match. You were bi then. You may be lesbian now. Or you may be working to figure it out. You may never date a guy again. You may meet Mr perfect for you tomorrow and he might rekindle everything you feel towards men. Either way, it's just a silly label. You are you.
Date who you want and don't worry to much about it.