Had a masculinity thread earlier today too. And yesterday some thread about drinking beer, based on masculinity. I guess internet geekdom is a pretty insecure place.
At any rate, there's no one way about it. Sometimes it's necessary for a man to hold his immediate feelings in. For example, I was in a car accident a couple months ago, a fairly serious one. I wasn't hurt, but the other driver was and it was important that I took care of her, called 9-1-1, spoke with officials on-scene, and did so in a reasonable manner. If I were to wear my emotion on my sleeve, I would have spent that entire scenario in a nervous wreck, crying and shaking. But I was cool, calm, and took care of business.
I had my nervous breakdown later, when things had calmed down and it was reasonable for me to do so. Note, that I DID actually have that breakdown. Emotion can get to me, emotion gets to anyone. IMO, being a man is knowing when it's okay and when it's not okay to let that emotion get the better of you. Sometimes, as a human being, you NEED to break down and cry. But doing it when somebody may need you to be strong for them is not okay.