I guess men who lie do so cause it somehow works for them. Maybe it is an easy habit. Maybe they think it is okay, they have excuses like "everyone lies" and "where does telling the truth ever get you?" etc.

Maybe they believe that since life isn't fair and everyone supposedly owes them something - they don't have to tell the truth. Or they convince themselves that they are telling the truth, just an altered version.

I bet sometimes this all traces back to how they are raised, but sometimes not. Sometimes it is their personality and their choices.

I'm learning to listen to my gut feelings, to pay more attention to my intuition.

For me, the more important the relationship is to me, the less I'm able to tolerate lying. A casual friend - maybe, my sweetheart and partner - not at all.

The more my self esteem improved the more I've been able to walk away from bad situations/guys.

We deserve to be treated well. We deserve being able to relax in a relationship and not have to stay on high alert for lies and deception all the time.

Good luck with what you are going through. If you want to - tell us a bit more, how close is this lying person to you?