i honestly dont understand a shit.. can anyone explain the whole lore?

So what I understand that they know each other for a really long time and that the top fall in love at a young age and its not allowed to have a much younger lover and the top fight for the bottoms love but for both of them Consequences the top is hurting his self because of thoughts of the bottom living him and he is scared and when the bottom don't get Attention from him he starts to get possessive and the bottom has a trauma now and also his getting nightmares and he starts to hurt himself in his sleep and the top thinks its his fault that the bottom is like this (sorry if my English is not good)