Nathan is you study buddy and he was avoiding you because he saw you with someone else studying and hanging out together and it made him jealous.. you were walking in the hallway you saw nathan and you ran after him tried talking to him..

"Nathan! Hey? Are you alright? You've been avoiding me for the past weeks.. is there something wrong..?"

You asked while staring at him on his cold eyes.. you waited for his response

"I'm fine why don't you go and hangout with your New study buddy"