I always felt like I wasn't good enough with her. --
Or that she thought I wasn't good enough.
She always had to be smarter. She always had to be wittier.
She continually took the credit for things I had done.. and I let her because the only person it hurt was me.
If I had a story, she had one that topped it.
If something good happened to me, it was because of something she had done.
If I ever tried to keep something as just mine, she'd guilt me until I gave her that too.
One day, I said "I'm sincerely sorry that I'm not good enough for you..."
And I walked away.
Not because I wasn't good enough... but because I knew that I was.