An undergrad in dire need of your input: This girl is messin' with my head.?

Hello again campers, and welcome to my thread. I seem to have a bit of a problem, see. This girl in my cl recently approached me and asked me out to lunch. We went. We then went again a week later, and have been doing a couple other things as well after cl. The thing is, sometimes she seems more detached, and other times she seems very into it all. I am just rather confused. She is actually about 3 years older than I, but a physical attraction as well as an ever-increasing "chemistry" has marked the past few weeks. She even recently asked if I would go with her out of the country for a month this summer. Input is highly requested --but preferrably only by educated, experienced responders. Please, none of you high-school kiddies and the like. Over and out.