My GF wanted to have an open relationship and now I feel like I'm losing her

I (M36) been with my GF (F32) for three years. We share a flat, and we see each other daily. One month she said she was bored with our sex life and wanted to have a more open relationship. I proposed bringing home men we date when I'm away from home, and she agreed to that.<br><br>My GF is a model who spends most of her time working away from home. When she's not around, I usually bring home a date (M) and we have sex with him in our apartment. Our apartment is quite large, so I have sex with the guy in my room while my GF is in her room in the apartment. The only rule is that we don't have sex in common areas like the living room or the kitchen. <br><br>My GF loves having sex when I'm not around because she says it makes her feel like she's cheating on me and that she can do whatever she wants. She loves having sex with the guy I bring home, and she's never complained about it. However, we haven't had sex together in months, and I'm feeling a bit lonely. <br><br>I feel like I'm losing my GF because she'd rather have sex with the guy I bring home than me. She barely spends time with me anymore, and when she does, she's distant and cold. I don't know what to do to win her back because she doesn't want to see me or talk to me. I'm worried that she might be in love with the other guy and doesn't want to see me anymore. <br><br>How do I get her back and make her interested in me again? Or should I just end the relationship and move on?