Should I accept gifts from someone I've rejected?

A guy friend of mine (we're decently close) confessed to me and asked me out. I told him I wasn't interested in a romantic relationship and wanted to stay friends. But he still wants to send me gifts and is willing to spend money on me in general. At first I attributed it to just him being nice, but now I suspect that a part of it is to, yknow, pursue me. Even though I clarified I'm not into him. I don't want to be narcissistic but I also don't want to take advantage of him. Am I overthinking this? Is it okay to accept his offers? Or should I turn them all down?
Should I accept gifts from someone I've rejected?
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