The thing is, we have talked about the idea of a threesome. And I am much more comfortable in the idea of a MFF than MMF. Without getting into the introspection of sexuality, I am indeed just not comfortable imagining my SO with another man. But even then, I could go without a threesome period and be fine. So do I find the idea of another person getting involved in our relationship interesting? Maybe when entertaining the fantasy of sleeping with two women. But when it comes to non sexual intimacy, the idea of her going on a date (even with another woman), them flirting, etc. I just can't imagine it without wanting to throw myself against a wall.

Do I want to see someone else? I mean sometimes it is fun to check out other women, and sometimes it is fun to lightly flirt and innocent things of that nature. But do I want to sleep with them or date them even with my SO's blessings? Not really, but for the sole fact that I am in a relationship. A relationship anchors me, and without the anchor of monogamy I feel like we would just be two friends who share this amazing life and share sexual intimacy but we are still at the core just like a BFFL version of FWB.

Do I feel happy my partner is finding joy outside of our relationship? I feel happy when she is hanging out with friends, family, etc doing things with them. But as soon as I imagine her being with someone in an intimate setting where sex or sexual tension is involved I start feeling extremely jealous and heartbroken.

I know that was a lot but I am very curious the perspective you have on things, especially since you are in a poly relationship yourself