Been dating a girl on and off for a while. I'm not really looking for a relationship and I just don't think it's going anywhere. I've told her this before, and I'm pretty upfront about it. She says that it's fine but I know she wants it to turn into something more. 

I've tried ending thing in the past because I'm pretty sure she is more attached to it than I am, but she reassures me she's fine with something less serious, doesn't care that I'm dating other people, etc. 

We don't do much much besides sleep together. She'll get upset that we don't do much else, but when I say we should cool things off then she immediately is "okay" with it again. So the cycle repeats.

I'm not really dating lots of people, but I know that this person isn't long term so I keep that option open. 

Am I the asshole for keeping this up? 