That's fucked. If I was dating a guy and he cried in front of me it would make me happy to know that he feels safe being vulnerable around me. I would treasure him forever after that.
On a similar note, my ex-girlfriend of two years was ranting about how men do not go to therapy. Then I mentioned that I do go to therapy, and been going from even before we met... and I will never forget the look on her face, she immediately stopped me mid sentence and told me she didn't need to hear about it.
She broke up with me the next week and said something like she didn't want to be with someone that goes to therapy, but rather one that went.
My sympathies for that rough experience. I hope you have a wider family and friend group that supports you taking care of yourself, and have or will find a better match of romantic partner.
Crazy thing is that I literally just connected that dot in this thread thinking out loud. I never once had the thought that expressing my emotions was unsafe, I just kind of took that feedback onboard and proceeded to not process grief for two decades.
Fuck, I can't remember the last time I cried openly. I know I HAVE in the last few years, but I can't remember when or why. Nothing romance related, but I just can't remember...