I got myself in a ridiculous situation a few years ago. A friend and I used to go out dancing fairly regularly (maybe once a month) because neither of our DPs were interested and we both loved to dance. Anyway after a while it became clear that while we never "did" anything we were getting closer than just friends so we took the sensible decision to spend a lot less time together.
I miss him and our nights out a lot. I never dance now, have no one to dance with and listening to music makes me cry. I'm not sure if I'm crying for him or for the good times, but music has the power to completely undo me. Generally I am fine, don't think about him from one week to the next and then a few tunes can turn me into a puddle. It's not even certain songs, but most songs.
I listen to radio four in the car usually and never have music on at home. Today I had an hour's drive by myself and thought I was getting stronger so I put radio two on. By the time I got there I was a mess.
It's been eight years and DH and I are fine. We have fun with lots of shared interests, just not dancing.
I don't know what to do about it. Christmas is coming, there will be parties, the things I used to love, either with or without my friend, but now I just find them unbearably sad.