
So the whole gist of this is that the 4 of them(1 guy, 3 girls) used to be friends but fell apart in highschool...got reunited and he did the deed with girl 1..who later becomes his girlfriend. While dating girl 1, he cheated with girl 2 which he's close with(childhood friend) and so breaks up with girl 1. And now he dates girl 2 and AGAIN..cheats on her with girl 3....
What if.. that guy(joker looking boxer) is actually the one who gave him the bad shoulder..but then again I doubt he'd forget if that person WAS actually the one