The thing about sexuality is that is fluid, and for more than one reason. You could be bi, but there are other things that you could be. I think the only one who can truly define it is you.
There are aspects about sexuality and liking others that differs. Do you have an emotional, intellectual, sexual, and/or ect attraction to this person? Some people are emotionally attracted to males while sexually attracted to females. Again, you have to determine what it is and to do that best is to try, even for a second, to separate yourself from societal norms.
Do a little bit of research. It can be possible that you are bi-sexual, pan-sexual (similar to bi-sexual but it includes trans and a-gendered as well), demi-sexual (you are attracted to those you have a close relationship with.