I don't. I think everyone has a right to tears. It's a natural healing, and society will demasculate men for crying, but I think that that is ignorance. Everyone has feelings and emotions, and everyone has a right to show them.
There's nothing wrong with showing your emotions. I don't exactly understand why this would make someone less manly. I would think constantly worrying over one's masculinity would be less manly. Don't hold back how you feel. There's a difference between crying and whining, I would say whining is kinda a bitchy thing but everyone does it in their own way.
I like it when a guy shows feelings in a relationship. They cry if their hurt, makes me think the guy has true feelings or is comfertable with me. Another thing is a guy that will cry in public, that again looks abit weird.
If you want to know why men don't cry, society is why.