If you ask a boy to hang out how do you know if he likes you or just being polite iff he says yes?

When a guy says yes to hang out, that doesn't necesarily mean hes into you. However it can be a way to start a nice friendship that can become more. It all depends on how you guys are with each other. So if he said yes it probably means he likes you as friends maybe more, if he wanted to be polite he couldve just declined and said to put it another time. At least he wants to spend time with you, it could just mean that he thinks of you as a friend.