My partner and I date solo, on a casual/FWB basis. We've had our share of ups and downs, but for the last while we have been going strong. Historically I've struggled with the idea of him dating (specifically the emotional aspect, not the physical) but that's felt good for me recently. Overall our relationship feels more solid than it ever has.

Until this week. He's matched with 2 different women who have both said outright that they're "one guy kind of girls" but who expressed interest in continuing to get to know him despite his partnered/enm status. Everyone is aware of our arrangement.

For some reason, I'm really struggling with it. I'm anxious, picking fights, questioning everything, overthinking in circles... Basically being awful, and exhibiting behaviors I'd thought were in the past. The women he's matched with prior to this week have all been very pro our arrangement and enthusiastic about what we're all doing, so these two are a little different but I'm not really sure what difference that makes in practice?

I feel like I'm acting crazy and I don't like it. Suggestions on how to shift my thinking? Other thoughts/perspectives on this?