Help kinda?

I need help finding this bl i think it is a manga i dont remember but i remember that at the start the mc is walking in like a line in the streets and that is how he meet the other guy and that close to the end of the story the guy leaves the mc cuz he wants a "normal life" or something like that he gets married and has a kid n the mc is like depressed n all then after like 3 years or so they see each other n the guy apologize n they get together n they died together in the hospital of old age.
sorry if it is too long n thx in adv (￣∇￣")