Should I give him his stuff back?

During the "process" of breaking up with my ex (I.e. I told him I wanted to break up. He constantly tried to manipulate things to make them seem like my fault, beg, use verbally abusive tactics, and etc. to try to keep me in the relationship/stall the break up) he decided to give me my birthday gifts that were severely overdue I.e. Three months+. I told him I didn't want to be with him but he gave them to me anyway as he was still trying to talk me into staying with me. After a particular incident where he assaulted me I broke up with him and stopped speaking to him. He began stalking me and begging me not to leave. When he realized I wasn't coming back he became petty/childish and was demanding his stuff back. Because of the pettiness I told him I wasn't giving them back. He said I took the gifts knowing I would break up with him. I reminded him that I told him I was leaving and yet he still insisted I have them. My friends are a little divided on the issue. Many think it was for the best I kept them because he's going to need to learn that the entire concept of pathetically demanding stuff back from a person when you break up with them is unacceptable and sad, especially if you've done it in every relationship like him. They've also said he needs to understand that I owe him nothing and he has no right to demand anything from me after all he's done/order me around, plus if I give them back it'll make him think he's won/has some power. While others say I should've just given them back as they weren't very cute anyways and so he can shut up. What do you guys think? Should I keep or return them?