Are YOU reading the correct story? ML made it clear he only wanted to help him from the beginning. He set boundaries, and even the job he gave him didn’t require him to be in contact with him. He turned him down and MC introduced him to his BOYFRIEND. “Tasted it and threw it away” MC went to his house when he was out of his mind in a rut, and even then told him to leave when he still had sanity left.

Why the fudge are people shitting an MC?!!?!
"He should know his place" What the hell?!?!?
"There is someone else who likes him" Aaannnnd???? Are you dating every bastard that likes you????!!?!?! If the heart was so easy to sway there would be no real love in this world!
ML was giving him false hope from the beginning, leading him on, showering him with affection, spending time and money on him with the excuse of a dead brother. He send all the signals and when he got a taste, he threw him under the bus.
Please, for the love of all, read the story again and if you can't find any false in ML and only blame MC, just stop reading. Neither you brain nor your heart can fathom anything bigger than Dora the explorer.