Should I completely forget about this friend or wait and see if he'll come around?

We been friends for a year. We were really close and everything was cool but then things started going downhill for no reason. Last I saw or ever heard from him was early November when we had classes. At the time I kept texting on some things but I noticed he kept ignoring each message. Weeks later he finally gets back to me saying he was really ill and had to take a break from school and now he's ready to come back and that he would see me later that week. But that week passed and I never saw him. Weeks went by and midterms hit in December. He stopped showing up in class and despite my attempts to see if everything's alright he kept ignoring me. Then I go on Instagram and see him posting pics of his vacation in Mexico. I didn't understand this.

When we came back from the Christmas break in January of course I still didn't see him or hear anything. I decided for the last time I would get a hold of him. I texted him saying I don't hear from him anymore, and ask why has he stopped showing up in class and if everything's ok? As usual, I never heard back. Tried calling, same thing. You would think he's going through a hard time but clearly not as he's very active posting pics on Instagram and posting his "stories" on there of his involvement with event planning which is what's he really up to now a days.

Point I'm asking should I completely drop him as friend and remove him everywhere?