Is it weak for guys to cry or show emotions?

Why?

No. Feeling sad, scared or hurt is normal for everyone, and crying is one of the ways the body deals with it. What matters is knowing what you feel and putting a name on it: "I'm angry", "I'm hurt", "I'm stressed". Guys who can name their emotions handle them better and blow up less. Holding everything in doesn't make it go away. It comes out later, usually at the wrong person.