<human>: Provide a brief overview of the text.

So I have been getting involved with a school group on campus, and in the process I have been working a lot with one girl who I seem to get along with well. We have been working on projects since last fall, and it's gotten to the point where we are doing something project related several times per week.

It seemed to me like she was starting to telegraph some pretty standard signs that she was into me: laughing a lot at things I say that aren't particularly funny, touching my arm while we are talking, playing with her hair while we are talking, etc. Usually we communicate by text or email outside of meetings, but once or twice recently she called to relay some information that would have made a lot more sense in an email or text message.

However, we only ever interact in the context of group projects. If we are both around before or after a meeting, or I give her a ride somewhere or something we will chat about whatever, and we seem to click, have a lot of the same interests, and so on. But outside of that our communication is entirely group related -- we are always texting or emailing about things that relate directly to the project at hand, and that communication is always very business-like. As soon as whatever problem arose has been worked out she will stop responding, or if I send something not directly related to what we are working on I probably won't get an answer at all.

Recently I decided I'd like to try to be friends with her outside of our group work (I'm not looking to date her since I have a girlfriend). I am curious if a) she actually is interested in me and is avoiding getting close to me in any way because I have a girlfriend, or b) I am reading this entirely the wrong way, and she isn't interested in being more than acquaintances, and c) if she is interested in me, is it still cool for me to try to befriend her?

I am horrible at reading people and I overthink things, so I'd love some neutral input here.
<bot>: Girl displays signs? (laughing at jokes, touching arm while talking, etc) Am I misreading this? Still okay to be friends with her if I have a gf?