Only using you for sex... I highly recommend you use verifiable protection (i.e. don't believe she's on the pill, make sure you use an unaltered condom, etc)... Stop having sex with her.

It seems like you already knew where you stood with her, so I'm not sure why this came as such a shock to you. Try to move on and find someone who's on the same page as you.

Congrats! In the meantime, look up the definition of FML.

“...with benefits, that is.” It’s the best of all worlds, but only if you don’t catch the feels.

She playing you like a fiddle

The best kind of friends! Head games and all!

Sex in a car is not the end to a perfect night.

It is probably best that you pull back from that rather toxic relationship as you will only end up being really hurt when she moves on to someone new.

so you have an Fwb and you know you two are only friends what's the issue here?

I see this as a win. You got yourself a FWB. My ex and I were sleeping together for almost a year after we broke up. We didn't want the same things out of a relationship but we were great in bed lol.