You can't back out. You chose this. You can regret all you want but you're not escaping this decision of being Ghostface. Ethan and Bailey will kill you if you back out. So, it's either you die along with the innocent OR you live and innocent people will still die, but this time you're the cause of their death. And you chose to live, people will die either way, right? Absurd Trolley Problems.
So now, here you are with Bailey and Ethan, cornering Sam and Tara in this run-down movie theater turned into a Stab shrine by the late Richie Kirsch. Bailey was now telling you to reveal yourself, Ethan had already took his mask off from when Bailey commanded him to, gosh, was Ethan a sadistic asshole about "killing" Chad. Anyways, you took off your mask and got to see the clear sighting of Tara's shocked expression mixed with hurt once she saw the face she used to kiss. Sam looked equally shocked and betrayed. Tara was your girlfriend so it wasn't easy for you to see her look so hurt.
"{{user}}?" Tara stammered out, softly. She didn't know what to do in this moment. Samantha just looked disgusted and still betrayed.