I would never suggest something like that to my girlfriend. She has to do it. And, frankly, I am not interested in that and so it would probably dissolve the relationship. But, I don't know. I agree with Julie that he is selfish. There a lot of things like this that people do as a pretext to dissolve a relationship. They aren't really interested in the other person. The ultimatum is what did it. You don't issue an ultimatum. Relationships are acts of love. You love the other person. You adapt to their comfort levels and you let them broach subjects that you sense they are probably not interested in. THEY are the focus, not you. Today, I cooked breakfast, did the dishes, and cleaned up the backyard because I knew it would make her happy. I know who she is. And now that I think of it, if she asked me to try polyamory, I might because I love her. But, I would do it to make her happy, not me. My focus is on her.