I'm back to my lowest weight this year, now to start losing again.

Do any of you ever feel guilty about losing weight?
I saw a friend the other day that I hadn't seen for a year. We used to be the same size but if anything she has got bigger since I last saw her. I felt so bad for her when I saw her as she was happy for me but looked so sad at the same time and I felt as if I had betrayed her. I know it's silly but it does happen to me from time to time and would love to help people but they usually just don't want to know if I haven't got a miracle solution.