First a little background. I'm about to start my third year of college as a physics major. I don't really date much (only one girl briefly in high school). This is mostly because I'm pretty shy and find it hard to approach women out of the blue. I've also been told I'm decently attractive, but I'm not that attractive as to have women approach me often. Last semester, I started taking my first foreign language class since I began college (for some reason it's a requirement for science majors to take a foreign language ). Anyways, I wound up loving the class. The first day of class I met a girl I thought was attractive and very intelligent. For this, we'll call her Women A. We had some things in common and I saw her in class everyday, since she was in both my lecture class (about 60 people) and my drill class (about a dozen people). About two weeks after classes started, she started inviting me to things. First, she invited me to some school sponsored service club. I was very busy this semester, so I knew I didn't have the time to join. I told her I probably didn't have the time to go, but I'll check and maybe see her there. I ended up not going, and thought that was probably the end of it. However, a few days later before our first quiz, she invited me to study at her dorm. This I enthusiastically accepted and we exchanged our phone numbers. When I got there I found out she also invited Women B, also in our drill class, whom I hadn't gotten the opportunity to talk to yet. I ended up falling pretty bad for Women B. We got closer as the year went on, while I pretty much started ignoring A. However, I never ended up asking B out. Partly due to my shyness, but also partly due to her never really gave me the chance. I gave her my phone number once before we started working on a group project, but she never contacted me, others in the group did. Later, I creepily looked B up on Facebook, and she had been in a pretty serious relationship for at least over a year. I feel like I got played with. She'd openly flirt with me sometimes, but never mentioned a boyfriend to anyone. I feel like I really should have given A a chance, I got too caught up in someone who only viewed me as a plaything to quell her boredom in class. Good thing is B is quitting the sequence for next semester, while A might be in my class again. Any insights on this situation? How do you avoid falling for the wrong girl?