[Blunder]

From my understanding:

1st thing is you've already had sex with her.
2nd is you feel that she likes you when you're seeing each other physically.
3rd is you feel that she might not like you because of her response when you're not seeing each other physically.
4th you felt that it was a kc trap and you felt u know you're walking into it willingly
5th you only wanted a short term experience.

If it were me, I'll continue this way.

However, as your stated your wants as a short term experience, why don't you just ask her straight to be your girlfriend. Since you're mentally prepared that she will leave one day, you probably wouldn't get as hurt if she decided to reject you. If she accepts you, then congratulations.

It seemed that you've got everything planned out already. Best of luck to you bro.