a fairly odd summer movie

Right before my wedding, my fiancé, Benjamin Gray, holds another wedding at an old settlement with his true love, who has lung cancer. He holds Jennifer Robinson close and smiles tenderly at her underneath the starry sky. "According to the local customs here, the woman whose wedding is held first is considered a man's actual wife. I might have already registered my marriage with Samantha, but she's more like my mistress." Everyone cheers and blesses them as they toast each other and enter their room for the night. I witness all of this, but I don't cry or kick up a fuss. Instead, I make an appointment for an abortion. I've loved Benjamin for 15 years, but I still can't compare to Jennifer, who is my stepsister. If that's the case, I'll let him go. Later, I join a geological exploration and research team in the South Isles and am cut off from the world. All I leave behind is a divorce agreement and a divorce gift. Benjamin has never cared for me, so it's odd that he loses his mind overnight after my departure.