Saw this girl in the train, got off at the same station. About to approach her, but she started calling her friend right after we got off the train. I followed her for a little to see if she got off the phone, but she kept talking, and she walked quit fast... I don't want to look like a crazy stalker so I stopped. Felt very bad that I didn't approach her, but I don't know what to do in this kind of situation. What would you do?