Help

I read this years ago, so my memories are a bit blurry. But it's a shonen-ai (I think?) about a guy head over heels about another guy. The thing is that the other guy is straight and our MC was delusional, literally imagining things in his head. Like the whole story didn't happen for real, and we discover the truth only at the end, when we see MC in a hospital bed. When MC woke up/realized that what he thought wasn't the truth (because I think his crush came to visit him with his wife or smth), he escaped the hospital to drown himself in the sea. That's how the story ends, on a panel with the waves or smth.

And I cannot remember what the name of this was! Please, does anyone know what I'm talking about? Sorry if it's hard to understand, english isn't my first language