Guy's Behavior

Why are we not talking anymore?

He said that he likes me and we talk everyday on call or FaceTime for the past 4 months but recently after his birthday he has been a bit off and I texted him asking if I have did something as he stopped texting and calling all of a sudden and he goes he is just ill. I texted him after saying ‘oh I thought u blanked me’ and he left my text on opened but he is able to send me snaps. We also go to the same school and normally he would try to talk to me when he sees me but now he walks past me and he sits near me in lessons but he sat far away from me and I don't know if it is because of him being ill or is it just me. But does he even still like me and should I be worried about it? Any advice would help.
Why are we not talking anymore?
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