Well, I've been dating my girlfriend for a little over 5 months now, 6 technically but who wants to be technical? Anyway, I always thought things were going GREAT, but up until a month ago I could feel her slipping. We talked about it briefly and I figured maybe I'd been misunderstanding everything, or mistaking the signs into something more serious. Tpward the beginning of our relationship, this guy started texting her and trying things with her, but she told him she was with me and he didn't back off. So they stopped texting after one big fight. But JUST recently, he started talking to her again and he's still trying things with her. 2 days ago, he told her he loves her and that they should say goodbye now because he won't be back from the army until October (he just left today). My girlfriend told him to stop saying it because she was with me, but he didn't stop and now they're going to start writing each other while he's away. She tells me all the time that she doesn't like him and that there are no more feelings for him, and I believe her. I've just been very, very worried about losing her because I love her so much. There's much more to this story, but I figured if anyone wanted to know, they could ask for details. I wouldn't want to bore you. I'm just curious, from that (or optionally more details), what should I be concerned about? Is there something I need to do or work on? I really need help and any advice is welcome.