season 4 will byers because thats 6 months after the argument he had with mike, leaving him questioning their entire friendship, keep in mind, which has been going on since KINDERGARDEN, and then he talks to mike in the van when their going to california and says EL, commissioned the painting, KNOWING mike liked el and that they were dating and he didnt wanna get in the way of their relationship because being queer in times like 1985-1989, was treated VERY differently to todays standards and some people even called it a crime to like the same gender, and even after all of this, mike didnt care and never saw the signs his BEST FRIEND, loved him. and they couldnt even focus because there was vecna, the demodogs, demobats, demogorgons, and plus, not to mention all the people that died along the way, so i like season 4 will byers and for all those people in the back, WILL HAS TRAUMA AND SOME PEOPLE DONT KNOW THAT.
its not just about mike
its the people that died along the way, and they recently saved him from a mind flayer that ENTERED HIS BODY, he gained PTSD, all his friends were emotionally differed from him, he had emotional outbursts,
and the part we all know,
HE WAS HAVING UNREQUITED LOVE AND FEELINGS FOR MIKE WHEELER.