How can I deal with my jealously?

I’ve been physically attracted to a friend of mine for a while now. The thing is, thats all it amounts to is an attraction based on her looks, and all she sees me as is a friend and thats how she wants to keep it.

I’m cool with that because we are close friends and she’s always there when I need her. The problem is, when I see her with other guys, I just get real jealous for some reason. It’s like I can’t help myself. I feel crazy because I cant seem to talk myself from it.

My question is, have any of you found yourself in a similar situation. If so could you give me some advice on what I should do to make myself feel better? Also any stories you guys have would help greatly.