Does he really like me or is it for sex?

You should instinctively know by the way he relates to you if its just for sex or if he cares about you. For example does he ask you questions on subjects far removed from sex such as music or movies or politics or religion? Does he have an interest in your family and how you grew up? Does he share his personal feelings with you - such as what he thinks of his parents? Does he ask about what your plans for the future are? If he doesn't have any interest in things such as these chances are its just for sex. But if he is interested in other things about you chances are good that he likes you quite a bit.