I am however very attracted to one of my close friends who is a girl. I am very comfortable with my sexuality, and I am very out. I'm just confused. It is okay to be attracted to her. Just because you came out as a gay male, doesn't mean you can't develop new feelings.
People change over time.
I know of many members of the queer community who first came out as gay and then came out again a few years later as bisexual. You are not alone in the feelings that you have. Most importantly, don't be afraid of how you feel and go with what is in your heart. College is time of wonderful people and experiences. You should only do what you are confortable doing, take your time if necessary.