WHY can't she hold eye contact anymore?

Anonymous
There's this girl I like and bump into her only once a week and we don't have any classes together (she was in one of my classes last year). This is at a community college.

We use to share pretty random but intense eye contact like we would stare into each others eye (but not for too long, but long enough for it not to be normal).

Now when I see her around we say hi and stuff and it isn't awkward, as if we are just normal friends.

But if I stop to chat with her and LOOK her in the eye, she will look me in the eye and then stare at my chest and then just I don't know , talk , but no more eye contact or staring at my shirt.

it's happened a few times already and I thought I had sauce or stains on my shirt. I find it awkward cause I'm looking into her eyes and she would return the look but then quickly look down on shirt/chest for a few seconds. I don't know where her eyes goes after that cause I get frozen when I realize she's looked away from my eyes onto my chest!

WHY can't she hold eye contact anymore?
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