How do you know if your crush likes you back?

Okay, so it's been like 4 months since I joined A-levels, and honestly, there hasn't been a single cute guy here—except for one. He's in my math class, and I find him so cute. At first, I thought it was just a normal attraction, but today I saw him in class and my heart literally dropped for a second. That's when I realized... I might actually have a crush on him. We've had this weird eye contactship (ifykwim) we just look at each other everyday (its not even normal anymore). I could be totally wrong about this, but I can't help wondering if he likes me back? I dont even have the guts to talk to him :( buuut how will ik if he likes me or not.

How do you know if your crush likes you back?
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