Girl's Behavior

Girls, Every time we have class this girl used to say hey to me and smile but today she didn’t, (question is down below)?

I’ll mention she has a boyfriend, but it almost felt like today she was avoiding me and I promise I didn’t do anything to make her upset, was it wrong of me to reach out to her through social media even though I didn’t ask for it yet, before I knew she had a boyfriend she used to be a lot less carful of showing signs of attraction and one time she even said heyyyy, it seemed like she almost liked me so when I made a move and asked if I could get to know her outside of class, when she told me she had a boyfriend I was shocked, and I didn’t ask her verbally because it’s strangely dead silent before class starts, I know I probably misread the situation but it felt like her eyes would dilate when she saw me, but the point is she did say yes to being friends outside of class but I immediately apologized and told her I was surprised when she told me she had a boyfriend, it’s been a few weeks now since then i didn’t want to interfere with her relationship but I do want to know what it’s like to hang out with a girl one on one even if it’s just as friends at least once before I am through with college, my question is where did I misstep and if I didn’t what could be on her mind I don’t want her to feel like I don’t want to talk to her I do feel my body language shift away from her in general when she isn’t speaking to me but that’s out of respect for her relationship and also because I’m introverted, I know I shouldn’t care but it’s not easy to approach girls especially in todays world, I don’t want to miss out on a chance to be friends with someone who was clearly trying to be my friend for so long, (I hope this is enough context, if you need anything answered let me know, thanks for your help!)

Girls, Every time we have class this girl used to say hey to me and smile but today she didn’t, (question is down below)?
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