It's the ultimate during the highs and the most painful in the lows...
I've been in this situation in which I believe she had feelings for me, although it was only for a few months. I think that we became intimate friends for the 3-4 months I had sessions with her, leading to the time that she went thru some emotional tough times in her life. At that time, she confided in me because she trusted me and felt comfortable with me. In this vulnerable stage, she started having feelings for me and I had already told her before how much I cared about her and had strong feelings for her. It was the greatest feelings I have ever experienced as we went on a few dates and had the greatest sex of my life (because she was the most gorgeous and sexy woman who I have ever met). But then, it ended very shortly as she met someone else and left me in the dust. It hurt more than anything I have ever experienced because of the sudden drop from such a high. Looking back, I have no regrets about that romance although it hurt so much for so long. Time heals. Also, other beautiful gf's, MPA's and SP's have helped lessen the pain.
You know you really care about an MPA or SP when you hope they get out of the biz as soon as possible and lead a more normal life.