Dear Panel,

 I am in a four year relationship with a guy who is the same age (20). We are both very much in love and our sex life is great. We gave our virginity to each other. Recently, he told me that if I ever slept with another man and regretted it, he would be angry but would forgive me because he loves me so much and he knows that I am still young. I haven't been interested in sleeping with anyone else (despite my numerous guy-friends), so when he asked me what I'd do if he sleeps with another girl, I was really hurt. He said he would never cheat on me but he asked in case he got really drunk and made a mistake. What totally broke my heart is the fact that he accepts the possibility (which I believe makes him more susceptible to do it) and expects me to be as forgiving as he would be with me. I think he is influenced by his friends. Most of his friends are not in steady relationships and have had more than one lover. Guy and I are happy together and are always spicing up our sex life. We have never pressured each other to be tied down and always give each other enough space. All this time, monogamy has been absolutely mutual and sex has always been a special thing between us. I feel so hurt and betrayed that now my trust has faded and I feel like I want to disappear out of his life without  warning, but find it so difficult to leave him. What can I do? Please help me!

Kassia