I have been on the end of being compulsively lied to....of course, at first, you don't realize it. Then when you realize, you aren't sure of one damn thing your friend saying...it's time to make a decision. I opted to call him out, and couldn't continue the friendship.
My friend mustve not realized he often told me about the strategies he used to lie to others-and that's how I knew he was using them on me! It was difficult because it was a friend in a group of my friends. My other friends hadn't caught onto his lying yet. It caused a lot of negativity amongst all of us. Now they see it.
Can the person stop? I'm sure it's possible...but they have to want to. I haven't had contact w my compulsive friend in a few years. There was a lot of ego going on with him. I doubt he's changed. If he did, I'm sure he would've contacted me by now. Prior to me realizing he lied about everything, we were good friends. If that makes any damn sense.