I didn't mind being the 'other woman' in the midst of things because I was young (19) and I had zero expectations. We hung out, went to parties, had the sex, but it was all very casual and fun. Lasted about 6-9 months.

I did, however, feel bad when I found out down the road that he ended up marrying that girl he was with while fooling around with me. I do wonder from time to time how that marriage worked out.