This is mpreg
So All Time Low is breaking up because Alex has a kid with his fiancé who he is getting married to soon. At the bachelor party Jack and Alex get drunk and have the sex . Alex just wants to pretend that it never happened so Jack agrees even though he doesn't want to. After the wedding Jack decides to move to Hawaii and stay with Zack.
5 or so years later Alex calls wanting to go on a reunion tour. Did I mention that Jack got pregnant at the bachelor party? Well now he has a kid that Alex doesn't have a clue about and Alex has his own family with his wife....DRAMA