“Your cis het boyfriend will break up with you when you start passing!”

Yep! It eventually happened, and guess what? It has been the tenderest, warmest breakup (if you can even call it that) of my entire life. His romantic and sexual attraction to me got gradually less consistent till it just stopped making sense to label the relationship that way. We're such good friends, and I regret nothing about staying together romantically and enjoying that full two years of transition with an incredible partner to celebrate with every step of the way. "It won't last forever" would have been a stupid reason to quit a good thing. No one should settle for any amount of time with an unsupportive partner, but if your partner is good and you're having fun, trust your gut, not bitter black-and-white blanket statements on the internet!