@hawkeye10,
I think that i have to give more details that would support my point of being disappointed and hurt, and that would give a clearer picture on the situation.
Our relationship started as normal friendship at work about 12 years ago. 4 years later, we started getting closer and we started to be physically close, he wasn't married at that time but i was. When he got married, the physical relationship stopped and we continued being good friends. Both of us were happy with the realtionship as it was and during that period i was always loyal to my husband. In fact my husband is the first man in my life, and this guy is the second one. Four years later, the physical intimacy started to build up again but i have to say that throughout the whole period, there were very few times where we had sex.
Our relationship wasn't all about sex, we appreciate each other on the personal level and we do admire each other on many personality traits. Actually, when he used to see me hurt it used to affect him a lot and he couldn't focus on his job because of it. When he felt that there was another man in the office who i was attracted to, he was very upset and jealous about it and told me that he doesn't want to think about what i might be doing behind his back nor does he want me to think the same about him.
So he and the nature of the relationship are the factors that actually layed the ground for these expectations. I am also lacking the "experience" factor with men in general and maybe this is what made me fall deep into this relationship more that he did.
But in any case, as long as this new woman is in the picture, i will not be able to trust him again. She happens to be married to his best friend by the way... In fact i believe that this is a chance for me to get out of this affair and focus on fixing things with my husband.