What does it mean when he said this to me?

I want to know if I am overreacting. I am 18f, and there’s a man I am acquainted with, I’ve known him for a few years now. I’m not sure of his age but he is quite older than me. He hits on me a lot, I don’t reciprocate because I am not interested mainly due to the age gap and he sometimes goes too far with it lol. But I am friendly with him. Anyway, the other day out of the blue he said to me “I won’t hurt you” it was off topic what I was talking about with him. It’s about the third time he’s said it to me, and I don’t know what it means but everytime I’ve heard him say it it sets off alarm bells and my gut feeling tells me to run, but I feel like it’s an overreaction because he has given me no reason to think that he would. I am just curious to see how others would interpret this, i can’t help but overthink it because it’s a strange thing to say.

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I forgot to add why it sets off alarm bells, there is good reason … the way he flirts he really makes me uncomfortable sometimes i forgot to add this, i probably sound crazy lol
What does it mean when he said this to me?
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