A sour jar is commonly used for this… it “sours” the relationship between two or more people. If you want something more neutral to simply and naturally dissolve all the interest and attachment, I have my own poppet technique I use.
Both work regardless of whether it’s a romantic, friend or business relationship.
Since you have time for the parasites prep, I recommend our collection of tutorials (below) and also getting a good book… I like Josephine McCarthy’s Exorcist’s Handbook, to learn all about them, the different kinds, hat can happen and the best ways to deal with them.
It’s ideally, imo, less a blanket “spell” and more hands on, in person and in your face conflict.
Cleansings and Wards generally (Keeping "good spiritual hygiene) will clear you and keep your household and relationships free of Parasites: prevention is better than the cure here.