I met a girl on a night out a few weeks ago. We were talking about sport and I mentioned that I played badminton. She said she wanted to play so we arranged to play badminton and go for a coffee the following weekend. We got on well but I couldn't decide if I was attracted to her (I was a bit but not enough) so I didn't really push anything. However we kept messaging and she asked if I wanted to go over to her house, watch some Full Metal Alchemist (I mentioned that I'd never seen it and she loves it) and bake some cakes (no idea where this one came from).
At this point I'm thinking that it's in the bag. I go over on Saturday, I'm getting mixed signals from her (at first it was seeming like a sure thing, then she started treating me like a friend). In the end I went for it and we started kissing on her bed. Then all of a sudden she just stops and informs me that she doesn't sleep with somebody until she's been with them a few months and has fallen in love with them; she asks me if this is OK with me. At this point I should have said "no" - I don't really see a future with her, I was just looking for some fun, short term thing. Unfortunately I'm not the brightest person when it comes to these situations, so in my awkwardness I just said "Yeah that's fine with me".
So now I'm not sure what to do. I don't want to string her along. But I also don't want to just end it by basically saying "Yeah I lied, I just wanted to get my end away". My current plan of actions is to just see how things go for a few weeks, and hope they fizzle out (basically the option that doesn't require me to actually make a decision). Any recommendations?