Find manga

Hi. I really want to find this yaoi, I read it pretty long time ago so I don't quite remember detail, but I remember some of it. So when I read it, it has 3 separated stories/couples but they know each other.
First story is about 2 friends in college: uke usually stays at seme's room, then seme find a job and uke misunderstand seme has girlfriend (she's in same club so just a friend) and find room to move out, then uke confess and makes love to seme, then HE.
Second story is about another 2 friends in college, they are friends with couple in 1st story: uke likes people who has handsome face, and really like seme's face. They meet and get along with a professor, this professor has handsome face so uke likes his face. The professor is friendly so he gets along with seme and uke misunderstood that professor like seme, and get jealous. Uke asks prof to go out with him to prevent prof stay close with seme, seme drags uke to stairwell and then uke confess, then HE.
Third story is about the professor from 2nd story: this story goes back to period time when he was a college student. He was very popular with girl, date many but not go well and has a best friend (uke) was in love with him secretly. He heard that uke loves him by accident (when uke said it to other gay friend), uke ran away so he chased behind, confesses and date with uke. Uke always in insecure feeling. Several common things happened, they solve it and HE. I remember 1 thing from this story is about uke's ex-sex friend meet uke (married and divorce) and want to go out with uke, this guy usually bothers uke and seme overheard the conversation between uke and this guy on phone so seme get mad and turn off uke's phone immediately. Uke and seme talked and understand issue, then they call back to that guy to make sure he don't bother uke anymore.

I'm so sorry because I wrote too much but I really want to find it again so I try to remeber all details as much as I could. Please, help me