What should I do if my boyfriend always accuses me of cheating?

Me and my boyfriend have been dating for over a year now and every little thing that I do he says were you with another guy? I said no way. No other guy wants me babe and he doesn’t believe me. He jokes with me saying you are a cheater lol and everything he notices a little thing on my body he says you cheated when I didn’t. Why is he like this?

What should I do if my boyfriend always accuses me of cheating?
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