Hey @lernersglobe, you have just pointed out psychological signs whether a girl likes us or not. However, I also want to add my experience to this great post. First, if you were just friends and now you are feeling something for her, then there are more chances that she is feeling the same because that's how negative and positive signs attract each other. Second, if she noticed you.

YES JUST YOU even there's a lot of people out there. Then that also means she likes you. Third, if she's especially waiting for you even everyone has left the class or office. However, these may be wrong but it can be a sign. I recommend all of you to ask her instead because this is the best way. Be a man and ask without any fear, I know she may get angry but you can get out of the situation where you are jumping like a crazy monkey right now. If she yes, then okay. If she says no, then don't worry just ask her why and if you think her answer is suitable, let her go.