Being in love with someone who doesn't share the same feelings is just setting yourself up for a lot of heart ache. The fact that this person isn't even available will just make the situation worse and has the potential to get VERY messy.

It's hard to back away from a relationship...especially if the relationship is with someone that you depend on for emotional support...but it's the best thing that you can do for yourself and for your friend.

Hopefully you can meet someone on here (or irl) that can offer you the emotional support that your friend was giving you who's a little safer (i.e. not in a relationship already).

Good luck!