Most Helpful Guy
You should never expect a guy to make some time for you. If he does he probably really like you, but it's not something to be expected of someone.
It could however be seen as a sign that he doesn't want to hang out with you, but that is only if it occurs on several occasions and not just a few.
Most Helpful Girl
If he regularly blows you off, or says he is busy but doesn't offer an alternative time to hang out, then sorry but he's just not that into you...