Sadly, in my work of spiritual clearance, jealousy or envy have appeared to be a very prominent reason as to why cursing or magic has been done. Jealousy of a sibling or a cousin are the most common jealousies. But love rivalry is a fairly close contender.
Mainly the clients I work with are the victims of jealousy, but sometimes they admit that they are the jealous ones, so if they wish to resolve the jealousy, then it can either be addressed within a personal prayer or during a session of therapy.
I also include clearing jinxes, no matter how they were created. Certainly it is common knowledge that if two people say the same thing at the same time, it is supposed to create a jinx, but other times, people or objects are known to be jinxed, even if nobody knows the origin.
And with regards to the evil eye. Generally, this is known to be a curse transmitted through a malicious glare, usually one inspired by envy. However, there is also the evil eye amulet, which is designed to repel the evil eye curses.