<human>: Summarize the given text in a few sentences.

I hope this post isn't to long.

A little background story first:

I met this girl about 3 years ago. Shortly after we started dating I told her I still had some feelings for another girl and couldn't date her. She was really persistent and told me that things between us was to good to give up. She developed strong feelings for me. I did not, but as I said she was really persistent so this went on for a while. We were never officially a couple, after all I didn't really have any feelings for her. I just found her attractive. After maybe a year I told her I didn't want to continue. We parted, but after a few months, and I don't know how this happened, we were in the same situation as before again. I think I should mention that I've become very indifferent and apathetic the last 5+ years, probably due to some family stuff. Another year or so went by until I decided to brake it off again. This time she was heart broken. Things had gotten a lot more serious for her and said she had found the person she wanted to spend her life with. She wrote me a letter explaining her feelings. Since then she has spent the night a couple of times. We can't go back to how was before yet another time. I have to deicide between breaking it off permanently or commit myself to a longterm relationship with her. She has been a great friend to me and has treated me really good, but I have never really loved her. If I break it off I'll probably never see her again, she's going to move to another city if I do. Because my decreasing ability to have feelings for people I'm not sure I'm going find someone I feel more strongly for. Except for my feelings for her everything is perfect. I feel a lot is at stake here and that I might end up lossing everything. I would like a family with a great girl and I fear I might be getting too old to meet anyone good. There are a lot of thoughts and questions, not sure if I managed to make any sense. 

Any advice?
<bot>: Been on and off for 3 years with a girl and now have to choose to comit myself to her or breake it off permanently.