My boyfriend is offended my male neighbor offered to mow my lawn. why?

My boyfriend of a year doesn’t live with me. I own my home , I’m a single mom and my lawn was getting a little crazy.

My male neighbor offered to mow my lawn. I declined and i mowed it myself.

My boyfriend is offended that he offered. Guys, whats this about?
My boyfriend is offended my male neighbor offered to mow my lawn. why?
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