My fiance and I have been together for 3 years now. I don't know if what's been happening is emotional cheating or is it his way of coping. Just before new years a younger, sexy girl started working with him. At first I thought the attention she was giving him would be good for his self esteem. His boss had a party for new years eve I could only get there after 10, after getting there I found out that he and this girl had been alone in the kitchen together all evening,flirting. I thought nothing of it because iv gained a lot of pounds since been together ( side effects of birth control, or so iv been told) and I'm not a very fun person to be around. A few weeks later I wanted to use his phone, I found some of the messages. My heart broke, he had been telling her intimate things about himself I did not know. She described in detail to him things she wanted to do with him in the bedroom. I confronted him and he told me it was nothing. I decided to confront her about it and she blew everything out of proportion. Turns out she is the bosses niece. Now I'm stuck with the pain and confusion of what happened and he has problems at work. What should I do