In the 2014 film “The Other Woman”, there is an exchange between several characters
King Kate: So what do I do now? So I'm, now I'm Barb Melman? Barb Melman got divorced and now she has cheek implants and lives in a condo in Norwalk and has to go on dates. I am not equipped to go on dates. The last time I was single, I was 24 and the dating pool was everyone. And now it's like a shallow puddle of age-appropriate men who are old and gross and I don't want to do that.
Cameron Diaz: I know that you think that it's that bad, but honestly, it's a lot worse. You know why? Because even if you meet a nice guy... and when I mean "nice", I mean that he's, like, not an obvious sociopath... you can't even actually get excited about it.
You know why? Because it's just a matter of time before someone gets bored and unhappy and is saying that it's over, and that's a happy ending. A shitty ending is that there's lying and cheating and you ambush Prince Charming's wife.
What does Cameron Diaz mean by "... and you ambush Prince Charming's wife."?