My SO help me in my car payment when I was out of work. He still working & since I'm working now he said he want his money back. Should I do it?

He didn't told me I should pay him back when he gave me the money but now I'm working it's different story

My SO help me in my car payment when I was out of work. He still working & since I'm working now he said he want his money back. Should I do it?
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