Hello,
I'm also a victim of lies, so I think I could give some advice. Of course, my case might be different than yours...
I am over 25 and he's over 70 (my father, the Psychopath).
My father makes friends with young people of my age and their families. It's not a normal thing, you understand.
He makes friends with my mother's family members, whom he hates and tells stupid stories about to me and my mom.
He manipulates them all and cuts my relationships...
So far similar to your case...
But when can't psychos tell lies and destroy ties?
When they have no idea about them!
So, I'd advise you to keep good friends, relatives, loved ones away from the psycho.
My very few good buddies I keep for normal people and exclude the psycho.
How?
-> they must never meet: if the predator cannot find them, he cannot lie to them, plain and simple...
-> but: make sure you keep all your phone numbers, address lists and your mobile phone, etc. away, perhaps out of the house (my Psychopath father found some phone numbers and visited periodically several tens of families, friends and torpedoed my ties with them!)
-> Psychopath must not even know that you have friends: my father knows only the mane of a few, whom he cannot meet and he is already inventing stupid stories about my friends (calls them satanists, homosexuals, drug addicts, etc.)
One of the worst things for a Psychopath is when he/she is excluded. You can have your clean life and he cannot have any "key" to the "locker". Go out into the free wide World and live your life!
This doens't mean you have to lock yourself up, isolate!
Don't get me wrong, isolate the Psychopath only. Eventually a few people that he is controlling.
Shortly: keep your life away from the Psychopath.
Also keep your job, career, health-related issues away. It's like keeping hygiene, but not in the physical, but in the emotional/mental sense.
Good luck, be strong & think positive