1.the story is about a useless guy in college the wants to live alone but his best friend insist to live with because he can done anything by him self,,,but his have a girlfriend for 3 years i think but never even kiss,,, and she love him like sister-little brother,,,and one hi see his best friend masturbate and him raped and was in blank because happens so fast his best fried confess his love and say somethings and i think he leave and like week past and his girlfriend go to see if he was still alive and end the relationship and his go to look for his best friend.

2.in middle school that boy reject a boy shortest the him and after two years the same guy but tall and start a relationship,,,both of them fight...

3.in high school one gay couple end for fault of talk and end bad in college a they meet again because a concert and they are in bad terms and i don;t reminder more

1.3rd chapter from Rival ni Ki wo Tsukero by Yamakami Riyu?

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Sekai wa minikuidesu..shika shi! Yūjō, yūki, tsuyo-sa wa ikinokoranakereba narimasen..Tiruendo!

I believe the 2nd one is Love Knot by Ichijou Lemon. At least that's what I think it is.