So I'm dating a guy who is in open relationship. The thing is, I only know this from his facebook profile, he never brought that subject up, and he is showing genuine interest in me, or at least I think so. He listens and remembers what I'm saying, is inviting to places that matches what I like doing, he's not rushing things. He seems to care, asks me personal things etc. But the thing with his open relationship bothers me, and I don't know how to talk about this. I don't want to get more intimate with person who already has the partner.