There was a _Twilight Zone_ on, the other night, about a guy who sold love potions for one dollar and the antidote for a thousand.
One of the easiest ways to observe how love spells can work is to watch the film, _Bell, Book, and Candle_. I'm not saying that everything is accurate, but like most magical fiction, there are some cool clues.
Life is short. Sometimes, it is better to ruin it, oneself, rather than wait for someone else to do it for one.