Just talking to him over text shows interest. If he misses class, offer to take notes for him or to drop them off. Let him know that you are aware about his girlfriend but still you wanted to let him know even if nothing will change after this moment, at least you confronted him with confidence. If you tell him that you like him he might spread it around and people could make fun of you because you like him. That I noticed.
Yaretzi. if you're looking for a more rounded, fulfilling encounter, or a 'girlfriend experience', rather than simply just sex, then i'm the woman for you. of course, i do adore sex and if that is all you desire than that's absolutely fine, but if you would also like to chat and laugh together or perhaps to flirt and converse over dinner and drinks, then i'd delight in being your companion. i honestly believe that sex is better for both people when there is a connection.
Use your common interests as a starting point.
15 Men Explain How They’d Like A Woman To Let Them Know They’re Interested
Your crush has a girlfriend. Show interest in his social life and hang around with friends he hangs around with. If there's an annoying teacher you both can't stand, or if you both hate a certain pop music star, you can have a good laugh over this together. Include your email address to get a message when this question is answered. Just casually talk about your upcoming plans or mention what your schedule looks like, and wait for him to ask if you want to do something when he knows you'll be free.