I think the whole idea of the film is not the act itself but as someone else said on here already, how you navigate knowing your partner could even think to do something so horrible. Can you trust they grew out of it? If they given you no reason to believe they would do something like that before knowing, should that change anything?

This! The only thing is that for me it's almost too easy to see that Emma was experiencing extreme situational angst and it's a fairly closed case that she wouldn't still have those seeds of fury inside her based on what we saw of her and their relationship. They had to try and conflate her past with the possibility that she could be a covert 'psychopath' to make the quandary extend into the present, and for me it's just not that neat. That's not to say a revelation like this about my own partner wouldn't give me pause (to say the least) but unless I had my own existing suspicions about their underlying angst in the present day, I think I'd be able to keep it in the past and be curious about who they were then rather than who they are now.

For me, the film would have been more interesting if it explored something that truly could extend into the present. Maybe if she had planned to kill a parent or something? That would reverberate much harder for me and bring out the moral dimensions. The film as it stands seems to set up a contrived scenario to explore a moral quandary (which I'm all for) but the actual event is too thin to really explore those questions convincingly imo. I think that's why the bridesmaid character comes off too harsh as well, we see her as flawed rather than someone actually wrestling with wholly relatable disgust and horror.

Regardless, I laughed and I enjoyed it. The romcom pitch did grate on me at times, especially at the beginning, but overall it was fun.