I have been with my significant other for 12 yrs and he can't stop lying about everything... he says he doesn't mean to but unless I can prove to him that I know what he has said is a lie he won't admit to it and now he assumes that if I say something that I am lying[which I don't do]... I am at the point that if he says it is sunny out I literally have to look outside to see for myself... Is there an actual medical disorder to this? He has lied to people his entire life... I guess it would make him feel better to make up little things but it has now turned into big things... I do love him but I know it's not healthy for a relationship for me to always have to check what he is saying... How can I help him stop?