Unfortunately, you say she's insignificant, but your whole post says otherwise.
It sounds like you need to detach from both of them. Put a little distance between you and them for a while, and fill the time with people and things that matter to YOU.
You're right, you don't need anybody else to make you happy. You can and should do that for yourself.
Eventually, she won't have the power over you she has right now. Then, she truly will be insignificant.
