Some people are insecure, or downright untrustworthy of their surroundings. Usually, it's not your fault if they are fake towards you. They have usually adapted their fake selves on others that it becomes a normality.
Hope this helps!
Answer:
What do u need help with..?
Both are at fault it's better to try to understand each other
The word "something" should be replaced with precise language.
Good luck!