My XABF lied before he became an addict, lied while he was an addict, lies still.
He is a deeply troubled person (hence the addiction) who used lies to make life go better for him. He may not have been pathological, but he is extremely manipulative. AND he comes to believe his lies. All of them.
Sounds pretty similar....don't count on sobriety fixing this in your X. It takes a lot more work to dismantle this sort of behavior.
Take care of you
Hugs,
GL