I (27F) have never really been in a serious non-manogomous relationship. I met this guy who is in one and we started dating. The fact that he had a girlfriend didn't really bother me at first. His girlfriend is long distance for a period of time, so I guess they will have had a long distance relationship for a period of 6 months total. He never compares me to her, but this man is obviously crazy about me. I have him wrapped around my finger. However I am skeptical about the ethics of the situation. He tells me stuff like he "only talks to her out of obligation" and that "their relationship is on pause" and that "calling her and responding to her via text feels like a chore". and that he doesn't even really miss her. He tells me that I'm his priority right now and that he is focusing on me "100%". I see on his phone that she is texting him constantly and he says he only replies like once a day.

I never asked him for any of this. I even told him I think he's a lot more into me than I am into him. He says stuff like "I'll miss you when you leave" as I'm going to be moving in a couple months. He tells me he wants to make the most of the little time we have together.

A couple weeks ago, I was going to go on a date with someone else and he got jealous. I thought it was the most hypocritical thing ever so naturally it caused a fight and after trying to rationalize it he says stuff like "my long distance relationship doesn't count for me right now" and stuff like that. I also dont understand because his girlfriend had another partner while she was also dating him.

Everyone I talk to says he is obviously cheating even if its an open relationship but these people I've talked to are also mostly monogamous so it makes sense. Just wanted to get more opinions on this situation. I've openly expressed all my concerns about this to him and his story stays mostly consistent. I just feel like I always want to know more, I want to see what theyre talking about and how much his girlfriend really knows about the situation. He claims she knows just about everything that physically happened between me and him, but not so much about his feelings. I'm not sure if she feels like she is getting tossed to the side and ignored and i feel guilty because it seems to me like he is more interested in me than her.