Why did he lie to my brother that he messaged me when he didn’t?

I was friends with this guy for 2 years at work, and he also knows my brother. Recently I quit my job about a month ago cause of management issues and horrible working conditions.

Last week or so my brother told me that the guy sent me messages on facebook messenger about a job that I might be interested in.

I checked both facebook messenger and instagram and nothing. I don't know if he lied about it, or he sent it and it didn’t go through or what.

I was gonna message him and say that I didn’t get it but I decided to ignore cause I had a lot going on at that moment and couldn’t really talk.

I might message him when I’m ready, but the way my brother told me about my friend messaging me, he said he sounded certain that he did message me but I never got anything.

Any ideas before I speak to him again? I don’t wanna overthink anything but also not ready to talk to him just yet (due to something personal)

Why did he lie to my brother that he messaged me when he didn’t?
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