Girls do it too, they are just advertised as being outwardly emotional & showing feelings, because society likes to represent emotions as being girls & girls as being weak, it is a double win for keeping people ignorant & making sure relationship counselors & dumb books get lots of profit cause no one is supposed to be human- they are supposed to fit the box made for their gender in social status... Even if they are not overly emotional, do not like to show feelings, one else believes them, because they believe the stereotypes.
Anyways eve of guys are said to be not emotional or show feelings, by narrow view of emotion it is not true because getting anger acting possessive or jealous or getting into fights-
( all exceptable ways of conduct for guys.) - that is emotional.
& Every one is emotional & acts out thee emotions- feelings - unless you are Socio -pathic - a dangerous condition where you can not connect to reality , do not experience empathy, & are likely to commit crimes such as murder just to FEEL something because you lack emotion or proper access to the.
It is not true that guys are not emotional, or show feelings, but it s true they are encouraged not to show it in quote unquote feminine ways.
Emotions are an essential aspect for morality, without emotion we would have a very dangerous world, more so then already exists.
I think a good question is to ask "Why are people afraid of emotions, & why do they except such a degrading representation, of a very important & useful aspect of the human psyche & nervous system""