He may be lonely and seeking a friend. If you think it's too much, you need to let him know. Be kind of dismissive and say, gee, I have some things I need to do right now, so catch you later. If you spend a little time with him, then later, dismiss him, he should get the hint. Think: is he an ourcast and does he need some friendliness? Be kind, but also don't allow him to intrude. You may at some point have to say sorry I'm busy or please don't disturb me during such and such hours. Put some limits on it, but be mindful that he may admire you and feel a need to connect with someone.