He did exactly what Max said he would do for El in Season 3 to Will

He chased after him. Banged on his door. Searched for him and stayed with him. Mike Wheeler is in love with Will Byers. (I forgot to add this to my analysis earlier and a commenter was nice enough to remind me of this parallel) BYLER IS SO ENDGAME. And isn’t it funny that right after hat clip of Max saying that they cut straight to Mike riding his bike to Will’s door? Yeah I rest my case.