The girl that I have a very casual relationship with is never free. She always has something to do, and it's never anything that has anything to do with me. I'm not being one of those clingy fucks. Our last date was a month ago, and we've spent all of two hours together since then, and half of that was just sitting there listening to someone else talk. Even though our relationship is very casual, I really like this girl, and I'd feel like a horrible person if I just started dating someone else, though it would probably take her a while to find out.

She's not going to have a lot of free time. That's just how it is. She's taking all of these gifted classes (even though she's not really gifted, just a bit smarter than average), and she's also in about six sports. I'm the exact opposite. Even though I score very high on preliminary college entrance exams, I'm just trying to relax and have fun in high school, because I recently escaped a very abusive situation in which I was not allowed to leave the house for anything but school (not even extra-curriculars).

There is someone else I'm interested in, and she is interested in me too. She's a foreign exchange student, so she's taking more relaxed courses than I am, and she's also decided to join several of the clubs that I'm in. She's pretty cool, and I wouldn't mind dating her.... BUT, whenever I flirt with her, I feel really guilty.

Advice, anyone?