Why is he afraid that he might hurt me?

He told me that if he didn’t know my brother, he would ask me out but he doesn’t want to because he thinks my brother won’t like it.

He also said he’s afraid he might hurt me but wouldn’t explain why he thinks that. I have a feeling he might have cheating or abusive tendencies but he’s been respectful to me and other women and he said he doesn’t put his hands on women but I could just be paranoid because I don’t ever wanna experience that. What other reasons could it be that he doesn’t wanna hurt me in any way?

If he knows how to treat women then he has nothing to worry about unless he’s afraid of losing me or I end up hurting him by accident or something.
Why is he afraid that he might hurt me?
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