I don't think Stacy is irredeemable. I could tell from the beginning that Luke was the one recieving more from their s** life. The way he pressured her to go another round even though she obviously wasn't feeling it... it's not fair. I'm not defending her actions, but there is a reasoning behind them- Ppl are always so quick to hate on these female "antagonists," but let's take a second to look at both sides first. I understand her pov, even if she was wrong for what she did. Growing tired of your partner but not wanting to end things is a very real thing that happens often in life. She is a realistic character and that is why I think she can be redeemed. Maybe she will get worse tho, idk. And don't twist my words guys, I agree that she is in the wrong here and Luke did the right thing by leaving. I'm just saying, I don't hate her
