Vacant_Entity wrote:
I'm guilty of doing that sometimes, and the reason is probably fragile/low self esteem, so by makimg themselves seem better, they feel better about themselves
Exactly this. Your friend has probably been shamed over being himself, as several of us on the spectrum have. So he attempts to compensate for what he doesn't have by stretching the truth a little. When people start to show impression back, he decides to stretch it a bit further, until he eventually ends up where he is now. Lying becomes an addiction; you know it's wrong and that you should stop. But at this point, you've done it so often that it happens instinctively.
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“Oh - You're a very bad man!
Oh, no my dear. I'm a very good man. I'm just a very bad Wizard.”
― L. Frank Baum, The Wonderful Wizard of Oz