When he invites you to go somewhere alone.
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It is very likely that if a guy responds to your texts when he is busy, he likes you.
That is not the only reason why a guy texts you or smiles at you. Maybe he wants you to be a friend and get to spend time with him. With guys, it is better not to make assumptions, because if he likes you, he should probably be able to say it to you.
He likes you.
my best guy friend does tht all the time! he used to like me and we still txt the same amount sooo he likes u or he just needs someone to talk to...
It means that he is a cheater who wants three girlfriends at the same time.