Crying is not a mental breakdown just like laughing is not a mental breakdown. It’s a natural expression of an emotion and it’s healthy - it helps you get rid of cortisol, so you should WANT to cry in appropriate circumstances just like you want to laugh. It’s a natural bodily mechanism that is good for you. You viewing it negatively and as a weakness stems from the toxic approach to these things in the culture you grew up in (and probably still live in, unfortunately).
Don’t know about Troubleinmind, but to me, weakness means inability to cope in a healthy way.