I love him and I don't want to hurt him
I will stay away from discussing the nuts and bolts of greater magic in detail as it is frowned upon by the COS members here. However, there is some general advice I feel I can offer, since you asked.
The Satanic Bible admonishes those who would practice greater magic at many points and I implore you to read it all, and take heed of the warnings about using the "wrong" type of ritual for the situation, as well as the warnings about each type of ritual.
The corollary to that is that before calling upon magic, it is necessary to have awareness of your situation and of how exactly you want it to change. (This is true not just for magic, too).
You plainly say that you don't want to hurt him, and you also state you want revenge. I would thoroughly explore the reasons behind this contrast before making any decision.
So, it is up to you. But I would advise you to be overwhelmingly certain of what it is you wish to achieve before calling upon magic -- greater or lesser -- to do so.
Or to quote Lewis Carroll's Alice in Wonderland:
"Would you tell me, please, which way I ought to go from here?"
"That depends a good deal on where you want to get to," said the Cat.
"I don't much care where—" said Alice.
"Then it doesn't matter which way you go," said the Cat.
"—so long as I get SOMEWHERE," Alice added as an explanation.
"Oh, you're sure to do that," said the Cat, "if you only walk long enough."