I wouldn’t say it’s a red flag from her, more so an inability to relate/empathize with your mental illness. I do think the “ultimatum” is a bit much, but you guys talked that through and got to the bottom of it.

If you’re happy with yourself then there’s no reason to do individual therapy. I was saying seek it out if you think you need it. I do think you need couples counseling tho, because a therapist in that sense can help her understand your struggle and maybe give you both the tools to manage.