It probably isn’t about you.
Expansion: People’s nasty behavior tells you about them, not about you. People aren’t nice to you because you are special, they are nice to you because that is who they are. Don’t let someone else’s treatment of you define you: it defines them. Similarly, don’t let someone else define your behavior. Be who you are. If you are a liar, then lie, but don’t tell yourself you are lying because of the other person. If you have integrity, don’t make that integrity dependant on who the people are around you or the situation you are in.