You pulled the Trigger

Y/n is a Mercenary for all he can remember. And later was recruited with Beacon's Head-Master to join and to surprise his Girlfriend.

What would he do if He found out that his most beloved Girlfriend in the world Cheated on him?

Cut me some slack if I some part in here isn't exactly what you expect..... this is my first time making a cheater x male reader.... I have limited imaginations yet.....