There is hope. I can tell you have been hurt in the past and it sounds like your "walls" are up and you are a bit guarded. I can understand why.
I think the best thing to do is confront him anytime you catch him lying. By confronting him, you have a chance of him realizing he is hurting you and possibly changing. Two things can happen.
He can either continue lying and you get to the point where you have had enough. He may realize he is about to lose you and he may change OR he may never change. We all can change.
Sometimes it takes consequences and perhaps you having enough and not allowing it may be consequence enough. I would not give up yet. Give him a chance to change and if he does not, he may not be worth your time.
I recently had a long talk with my daughter, Funny enough we were watching "Teen Mom. " Tyler on Teen Mom is an awesome role model for teens and adults. After seeing how good he treats Kaitlyn, I told my daughter "Never settle for anything less than how Tyler treats Kaitlyn."
There may be far and few guys in the world like him, but there are some out there. You should expect to be treated as good as you treat someone else. Settling should not be an option.
Looks do not mean much, but if you find someone that treats you like gold, hold on tight.
He is not dishonest, he just fibs a lot and gets by with telling white lies. Now if he starts cheating on you, stealing from you and committing crimes, then you need to worry. When you catch him in a lie, call him out.
After a while he will stop because he knows you are on top of things and cannot get away with it. You all are too old to play the get in trouble game. Give him a taste of his own medicine and he will start being more honest and less forgetful.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.