I'm dating someone who has other relationships, and it really upsets me

I met this amazing guy who just seems so perfect, I've never met anyone like him before. He has intimate and sexual relationships with other women and it makes me feel extremely uncomfortable. I've told him this and he says that I am special to him but he’s not going to stop the other relationships with other people. I really don't know what to do, I like him so much but every time I know he’s with another girl I get very upset and jealous. I hate that this is a problem but I don't know how to go about solving it without losing him. All my friends think Im crazy even considering him if it hurts me this much but I really don’t want to lose what we have. Please advise me on what I should do!

You say this guy “seems so perfect,” but he’s not perfect for you. A major part of his relationship terms make you “extremely uncomfortable.” You say you don’t want to “lose what we have,” but what you have is a relationship that makes you feel “upset and jealous.” You should not date this person, because it sounds like he’s polyamorous and you aren’t compatible with a polyamorous person. It is not a “loss,” it is you realizing that this arrangement is not working for you. He might be a great guy, but he’s not someone it’s healthy for you to date.