Why would a guy make up that he has a girlfriend?

A friend asked me out and I said no I wasn’t looking for a relationship at the moment as life is good being single and he then out of nowhere said he had a girlfriend..

weve been chatting since and he never ever mentions her ever and so I thought I’d ask about whether he was still seeing her and his answer was vague and he said ‘oh it won’t affect our friendship I’m wary now ‘

I’m not sure I believe she exists …. so if she doesn’t then why lie?

Why would a guy make up that he has a girlfriend?
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