Thank you all for the clarification. This is something I am just starting to understand and still feel like I am only standing on the edge of it. I much appreciate the wisdom here from those of you who do have a deeper more complete understanding. I have no problem with protection spells for myself - that makes complete sense to me. But just now moving into the idea of doing a hex or curse on someone. I have not had cause to explore this previously but there is someone in my boyfriends life who has a great deal of black energy towards him - not because of anything he did, but because they want to take something from him - just because they think they can. so, I need learn fast.....but am starting to get some light on this so thanks. I have lots of pent up rage and anger towards this person so when I get it all straightened out in my head I will have plenty of fuel for it.
Some good advice there from Degu. Something also to possibly consider is a form of binding, just be careful you don't bind it to yourself. A hex or curse may not be needed, lunabelle, for what you describe - although you obviously know the situation more than I.
I'd perhaps look at some method of absorbing this energy. I've had good results establishing shields that feed on the negative energies of others and strengthen themselves as people project negativity toward either myself or those I love. That way, the worse the problem gets, the more effective the protection becomes.