getting back together

Hey guys, I've been noticing some strange pattern in the girls I managed to pull. It basically goes something like this: - I meet the girl, she shows a lot of IOIs - we end up fucking relatively quickly (on the first date for both, up to 1- 2 weeks of meeting her) - I either find someone else...

A little bit of background: I have been going out with this girl a couple of months now. She is doing her semester abroad and she is probably gonna be here for 2 more months. We started this out as a casual relationship, but it somehow got serious. The sex has been good, but it was not mind...