Not sure if this was an arc or story but in it the ML is suicidal and barely managing to stay alive, life with no purpose. Then when the MC came into his life he changed a bit and began to depend on him. One instance If I remembered correctly is where is gets I'll but doesn't have his contact medicine or something like that only to listen after he is told by the MC. A problem that arise was that the MC and ML weren't together so it was not certain wether the MC would stay and if he didnt he might get even worse..
I don't know if you found it yet but I think it might be "Transmigrate into the abandoned star"? Not sure if title is correct tho but I just came across it again and remember.