Of course you have feelings for her. Don'r have sex with her again. She uses it as a weapon to get what she wants. That's all she thinks she's worth.
Take jak58's advice.
Go over to her house and get your keys.
If she doesn't give them to you, change the locks, fast.
Look, if this was your wife, and you had kids together I would give you different advice.
Run, dude, run. She's been so abused, all she can do now is destroy relationships. She's a maneater, femme fatale, home-wrecker, Maggie-May.
Run.
This woman belongs on the Springer show.
She's pursuing a man who has a baby with his girlfirend (it's basically a common-law marriage.) She's not sure it'll work out with him, so she's hedging her bets and coming back to you.
I give a louder no and physically pushed her away. That kinda stuff is hard because of course I still kinda sortof want physical things and occasionally now I wonder if I should even just try to salvage some type of physical only relationship as she seems to be suggesting and what would be the positives and negatives of doing so (I would guess the positives would be the sex and continuing to see her; the negatives would be some continue lying, mistrust, and confused feelings, plus maybe depending on the day continuing to see her; I don't know if it would be more positive or negative).
Err....salvage a physical-only relationship?
By the way, there are very few physical-only relationships. Dogs have them, some humans can, too. When you sleep with someone, you are saying, in a non-verbal way, "I belong permanently and exclusively to you."
The charater Julie, in the movie Vanilla Sky, said to her ex-boyfriend, "When you sleep with someone, your body makes promsies to them even if you don't."
Are you insane? Do you want to have sex with a psycho? She's a Black-Widow dude.