Prologue: Founding out

Stiles was certain that when he married Derek Hale that is was going to be for life. But after discovering that his husband is a cheater, Stiles starts to reconsider their relationship and does everything he can to mend it better. But only one of them is trying. Derek on the other hand, continues to disrespect Stiles by seeing different women. How long will it be before Stiles has enough and calls it quits?