How do you break up with someone after they gift you something?

My bf stopped by the mall over the weekend and bought these really cute outfits. Today, he kept calling while I was at practice & I got mad & told him to stop. He continued. It’ll be like that sometimes and I’m one to get irritated easily especially at clinginess. I want to break up with him but I he just bought me clothes recently and I don’t want him to think I wanted his money or something. I would return the clothes but he knows that I know he’s just going to tell me to keep it (we’ve been through this before). I’ve tried returning something he purchased for me when we broke up about 4 months ago & he told me to keep it. He told me he gave them to me as gifts not to appease me or something. Idk when would be the right time or how I can break up with him.. all in all, I don’t want him to think I want his money or that that was the reason I dated him in the first place