[stephenspower]

I wish the last line had cribbed from "When Harry Met Sally": "You're right. He's never gonna leave his wife."

The title would be more fitting if the narrator decided at the end to kill her lover's wife.

I find L3 awkwardly constructed. "Though they loved with a passion bittersweet" would work better as "Although their passion had been bittersweet." And in L4 "upped" should be "upset." I can't decide if "applecart" is really appropriate when it comes to "war" breaking lovers apart--consider Jennifer Jones's movies--or if it's a good reflection of a Myrna Loy cynicism.

I don't think you can use the groovy (and cliched) "bad karma" in the same poem as the pre-60s "applecart" and "tart" (and later "films") which themselves only work because the movie being watched must be an old one. Today's rom-coms wouldn't end with violins, but an upbeat pop number in order to help sell the soundtrack.