She needs you bro. The last thing she needs is for you to leave her like everybody else did just because she's too difficult to deal with. She isn't close to her friends anymore she can't depend on them like before. She can't go to her family because they don't understand her. Out of everyone in her life, you're the one she's closest to. She depends on you to be there for her because if it were the other way around, she wouldn't leave you, no matter how crazy you get.