My "gf" came back from a vacation. We weren't "going out" but we were dating and we established that we are monogamist. She had hooked up with someone while she was away. I said ok, w.e... I didn't care but she told me further into our conversation that she also gave him a hand job while he was fingering her and feeling her up. Made him cum and still talks to him. She claims she loves me. The reason this came up was because I asked her out and got her a diamond necklace from Kay jewelers. She didn't know about the necklace because she told me no when I asked her to be my girlfriend. We talked and she has feels for some guy on the other side of the world that she met once for maybe a week. I still love her and would take her back but something tells me no. I dont feel right. This whole thing shit on my day. I've with her (dating/going out) for 4 years this summer. We've known each other for 6 years. What do I do, go with my heart that says "She will never do it again if we're going out" or go with my gut that says "She'll do it no matter what and i need to move on..."