Do guys really mean what they say?

It depends. If the guy is honest and you know that for a fact - yes. If he has a past of being a player you might as well leave him before anything serious because he has probably said the same thing to many other girls.

This person above me is right,if you know the guy is a truthful person then he most likely means it,if he has a bad habit of lying and goes through girls like they're going out of fashion then he most likely doesn't mean it,but if it's too difficult to go off those lines,then your heart will tell you.