the uke had an abusive household and was tricked by his first live, that's why hes so cold to the seme. He probably loves seme but he felt really bad when he saw his grades slipping. He felt he was in the way and seme wasn't focusing on school. That's why he broke up with him.
I think she's just a controlling bitch. She must love it when Mayumi doesn't have anyone but her to rely on, so she always make sure than she is alone and doesn't have any self esteem, like that she can be her "everything"
the meme is too niche I didnt get it
I though that I was the only one