So some new enlightenment

So the previous days before after complaining about my luck with women and how this is a new beginning I am thrown into some interesting situations. The first involves a girl I knew that I just met randomly one day. I see her walking, note I am just hanging with my friends and she would have just walked by, anyway I see her and say her name and she stops. She walks over beside me we chat and then she says she has like time to kill while waiting for someone(her roommate) and I say cool and we part ways. Now at this point 4 of my friends are looking at me with awe, and Im wondering what the problem is. Apparently when she said that I was supposed to say hey wanna hang out while you wait, because if she wasn't interested she would not have A. Told me that she was waiting and was bored, and B. Would have came over to where I was in my personal spot. So yeah im kind of oblivious to things. Case 2, I see a girl who I noticed kind of stared and smiled at me twice while I walked by, so I stop and try to talk to her, I get her name and whatnot and then she explains to me what she is working on. So I figured she was busy and didn't want to be bothered since she said she wouldn't be able to pay attention to me there too much, so I said goodbye and left. Apparently when I told this story that meant I was supposed to stay and keep her company, doh, strike 2 and only in the last 30 mins. Note I am oblivious, Im new to this, I dont know what girls are thinking or body language or flirting, all this is foreign territory to me. Strike 3, I am in the art building waiting for a girl I know who is a friend of my crush for the last 2 years, so I meet up with her and we talk, I walk her to her car and then we start conversing, and at that point she asks me to accompany her to get some gas. So we go to the gas station, all while having awkward conversation in the car, at least for me it was, and then after we rode around for a bit and talked I head out and she tells me if I ever want to hang out or if Im bored to call her and she would pick me up or we could meet or whatever. So at this point apparently thats a hint that she might be interested even though she clearly said she was interested in another guy, who when explained seemed like a mooching ass. SO yeah today was interesting and its not over yet, I still am going back out, Ill update this if anything significant happens. I need a crash course in women because after getting courage to talk to them I don't know where to go next.