Yes, he can take you to court in the sense that it is almost impossible to stop someone from filing a lawsuit, especially a small claims action, against you. However, you should have a good chance of winning: if he moved out and left his belongings behind for a year, it is reasonable to conclude that they were abandoned; and if they were abandnoned, you could throw them out. Based on these facts, you may well be able to convince a court that he abandoned his belongings, because he did not do anything about them for a year or more.