So, I'm 25 was a third partner for an open relationship couple. The relationship has ended because after 5 months of being together, the person I was with realized that being a partner, being a dog dad, his work, and personal friends...he can't have me in it and he thinks I deserve better than the attention span he's giving. And he wants us to continue being friends even if we're not a couple anymore. But, what's strange to me is that he's still open to the idea of sex and romantic relationships with other people in the future. I asked him if that was the case then why am I the exception? Why was he breaking up with me and instead work this out? He said that if things go south, he still has a good support system but he's not sure I do. But I'm still confused. If he can't handle a second relationship, why claim and present himself still interested in others?

I wanna ask the polygamous people here, if y'all have the time, based on your perspective. I want to know the mindset of polygamous people and if y'all think he's being true or he's just making up an excuse because he doesn't love me anymore.

Thank you for future responders. (Sorry for my bad English, not a native English speaker)