is she acting like this because of disinterest or does she like me?

There's this girl, we go to the same college and met at the beginning of this summer when we both were taking summer classes there. I don't see her all that often, especially after the fall semester started. At first, when we met at the library, we sat close to each other and talked quite a bit, and this went on two more times over the next 2 weeks at the library and we seemed to get along quite well. After that, we stopped seeing each other for a while, since we don't actually share classes or anything. About 2 weeks later, I went to a guest speaker lecture (for fun) and it turned she was there too. When we took our seats but before the lecture started, I noticed that she turned her head and looked at me, twice, but didn't say hi to me either time even though our seats were close enough. After the lecture, we lined up to get free food from the event and I saw her walking towards me then passing right by me but completely avoiding any eyecontact towards me. However, when I started eating, she walked behind me and said hi to me, and when I turned around, she was already walking away and approaching to talk to someone else. About a week or 2 later, we passed by each other on the street (in opposite directions) once, and I saw her smiling but looking down as she approached. A few days after that, we ran into each other at the intersection walking in the same direction. She said hi to me, asked how my birthday was (she knew since we are facebookfriends), but after we're done talking about my birthday, I try to talk to her about other stuff and all of a sudden her she turned incredibly awkward and started answering me in short one word responses. We then walked together quietly for a bit before she went inside a store and abruptly said bye to me. So all of this seems like positive signs that she likes me but is just shy.

BUT, when I approach to talk to her on facebook, she gave really short responses. First time, right before class started for the fall semester, I asked her how the week before went, since it was the week between summer session and fall semester and she went home and went on vacation. Her replies were very curt and didn't make an effort to keep the conversation going. So I thought she might be busy or something. A few days later, I decided to ask her how her semester was going, again very short reply, and then when I asked her what classes she's taking, it was marked as "seen" but she never responded.

I haven't ran into her once on campus since fall semester started.

Now, one thing I realize is that girls can act weird and awkward around guys for 2 almost polar opposite reasons. Either she is doing so because she likes you but is shy, or she knows you like her but is not interested. In her case, the facebook messages seem to imply that she's not interested. But if she was really disinterested but just trying to be polite, why would she go up behind me and say hi to me from there when I can't even see her? And I saw her smiling and looking down when we passed once,which I also know is an indicator that she might like me, though of course, it's possible she was thinking of something else.

I do plan on asking her out around next week since I saw on facebook that she's going to an event that I'm also going and I'll try to talk to her there.
In the meantime though, do you guys have any thoughts on this?

 

Well, I have been married a long time and, therefore, out of the dating game for quite a while. However, I am also a sales guy and know when it is time to "trial close" a deal. This is the time for you to do exactly that.

See if you can have another "chance encounter" with her in the next few days. Then go up to her and tell her that you have been noticing her a lot around campus and you would like to do something together with her. It could be meeting for lunch at the school, studying together in the library, or something informal like that. It does not have to be an "official date" or anything like that the first time. Just a chance to spend a little time together and get to know each other a bit better. I would not do it on Facebook because it is so hard for both parties to know what the other is thinking with typed words. But it is definitely time to ask and see if she is thinking along the same lines that you are. No sense obsessing about it and trying to figure out what she means with every little twitch...just ask and find out once and for all.

 

Absolutely this. You'll never know if you never ask. And please, please, please don't use FB. While it may be easier, the feeling of doing it face to face is the best thing ever.