This sort of situation is how I knew my wife was/is a keeper. When I was pushed to the point where my negative emotions got too much, she was there for me. She didn't shy away, but stepped in to help and support me.
In many of my previous relationships, showing negative emotions was lethal to their feelings. I could be happy, or stoic, but never upset or depressed.
On a side note, I had a chat with a trans friend once, regarding emotions. When they transitioned, the intensity of their emotions didn't change much. However, their ability to contain them plummeted. Basically, men and women feel emotions similarly. Men are just a lot more able to bottle them up.