Percival was the love 'em and leave 'em type and he had absolutely no qualms about seducing his friends naive, teenage brother Newt with no intention of keeping his promises of "eternal love".

Too bad for Percival that he ended up getting Newt pregnant and ends up having to marry him for propriety's sake. He puts all the blame for losing his "freedom" on Newt and uses every chance to let him know. He's also not very fussy with his vows.

So when he hears about Grindelwald sentencing Newt to death? A part of him wishes Newt hadn't escaped until he overhears his Aurors discuss Newt's lack of response to the death sentence and a little voice tells him that it's just not right.