As a guy, we’re indoctrinated to make the first move. And we know how hard that can be.
So, if a girl makes the first move of communication/contact, we will notice. And if we think you’re attractive, we’ll respond with the normal interest cues.
During any conversation, eye contact, smiles, and making plans for “next time”, even if it’s just “See you in class Tuesday” all communicate that you’re interested in the possibility of a relationship.
Try to observe your friend and pick up on anything you might have in common. If nothing obvious comes up, you can always talk about class.
The next step – regardless who suggests it – is to meet for a beverage or snack sometime. Try that.
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A real relationship will not develop until long after the crush is gone. You don’t really know this guy. The emotional part is fun while it’s fun, but can be devastatingly painful, too. Protect yourself and be smart.
Finally, if, down the road, dude does break up with you, try not to go psycho and stalky. Act as you would want him to if you break up with him instead.