An impasse?

My best friend and I knew each other all through high school. We’re in college now and still close but there are some…complications. We have feelings for each other and have talked about it but she doesn’t think it’s a good idea to act on those feelings and be together. She’s afraid of what would happen if we broke up — she’s not willing to risk our friendship. I’m confused because she’s said in the past that she could see herself marrying me. If she can see a future for us, I don’t understand why she would be looking for reasons to not be together. If she can see us getting married, who’s to say there would ever be a breakup to go through?

Anyway, the problem here is that in the meantime, I don’t know how to handle the fact that she still wants to date guys. She has said that she doesn’t know what to do because she doesn’t want to hurt me by being with other people, but since being with me apparently isn’t an option for her…

I get jealous of these guys that she talks to and now IIII don’t know what to do. Seeing her date some guy and be unhappy would suck because I would know that I would be better for her. Seeing her be happy with a guy might be even worse, because not only would I be wishing that I was the one making her so happy, but I would feel guilty knowing that a best friend is supposed to be happy for their friend’s relationships.

I know that distancing myself is an option but it’s nearly impossible to do. When I say we’re close, I mean the kind of close where she refers to my family as her own (though it should be said that she and I have never thought of each other as sisters..). She’s too closely tied into every aspect of my life for me to just walk away from our friendship.

I feel like this question is rambling quite a bit, but does anyone have any insights for me? Maybe an option I’m overlooking? Any advice would be appreciated.

Also I can give more details on the nature of our friendship if necessary.

Thanks so much!