Please, give me your opinion, what should I do? I suspect my girlfriend may have cheated on me. We are a late 30s couple, been dating for the past 6 months, our relationship is great, great sex, conversation, companionship, etc. She was very insistent that I moved in to live with her, so I did. Recently, she took a trip to Europe with a girlfriend, for 21 days, they travlled to several countries..