Good questions!

So in an ideal world, if you have a feeling. You should be able to say something like "I am having emotions and I need some time alone to deal with it." and then leave the area to find a safe space.

Unfortunately, we are rarely living in the ideal world. The next best thing to do is to communicate that you are having feelings and might do some wacky stuff. Only do this if you feel safe to do so.

If you don't feel safe to communicate or go find a safe space, then yeah, your kinda stuck to power though it. If you find this happens often you have to weigh weather or not it is worth changing your situation. This is very hard to do and is a result of pervasive toxic masculinity and bad luck.

As for the situation with your x it could be a range of things from she was affected by toxic masculinity as well (the expectation that all men need to be emotionless) or at worst, she was using the fact that you didn't feel like you could show emotions against you. So when you showed emotions, the gig was up. Either way it sucks, I am sorry you went though that.

My personal preference is to only date people who understand that all humans have emotions. You need to make your own calls in this regard. Again, unfortunately, we don't live in an ideal world.

Part of the challenge of moving away from toxic masculinity is we have to be firm with our boundaries. This may get expensive, so you have to weigh out how much life suck you can deal with. Its not always clear what the right answer is.

Good luck!