I have read long time ago a yaoi manga. All I remember there was an all-boys school. The main guy slept with his rommate but he didn't love him, he loved somebody else and he dumped the roommate with harsh words. After that the rommate was really depressed and out of desperation he tried to commit suicide, he jumped off from the roof.

I thought it was Michiru Heya but not. I read it today and it wasn't what I'm looking for. But it is very similar to Michiru Heya.

Now I remember!!! It's Boys Love 2 dorama. It's a really good movie, if you have time watch it! 😀