How do I act around a girl that I like who has a boyfriend?

Anonymous
I asked this before, but never got any answers so I'll try again...

So last week, I started college and got arranged with my classmates who I will be working with for a year. Everyone here is nice so far, but there is one girl in particular who I have my eye on. She's 19 and I'm 18, and I find her really gorgeous. I haven't spoken to her much yet, but so far when we have spoken during class she's been very nice to me and seems to like my company. I'm very willing to get to know her more, especially since we'll be working together in class for a year from now!

After my third day of college, she added me on Facebook and so then I accepted her friend request. I then decided to take a look at her profile, and suddenly I then felt like I had been shot in the chest... Her profile appeared to show that she has a boyfriend, possibly been going out for more than a year.

She has many photos taken with this particular guy, although they aren't kissing or anything like that, they're just standing with each other. She's does however have a prom picture with him as well that was taken two years ago. Her relationship status says she is 'single', and when I checked her possible boyfriend's profile it says he is 'single' too. However, he does have a profile picture of him standing with her. (Again not kissing or anything)

Anyway, for now I am just going to safely assume she has a boyfriend to prevent myself from getting false hope and getting another sting in the chest. I don't know what to do or how to act around her now. If my suspicions of her having a boyfriend are correct, then it's not gonna be easy for me to 'just move on' considering I will be in her class for a whole year. So I am just wondering what do I do? What should I do when I'm around her and how do I cope with my feelings?
How do I act around a girl that I like who has a boyfriend?
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