"I've spent five years of my life completely dedicated to someone. That appears to just do whatever the **** she wants. And only care about herself.'"
Doesn't that say it all?
I would leave her alone. This whole thing stinks to high heaven.
Honestly, I would rather be alone than with someone like that. Especially if I couldn't trust her. She's a user.
You are confusing love with desperation.
Just go NC. End your problem.