So my reason is a bit personal, but I wish to make someone forget someone else. My mind will not rest until this is done. Honestly its become such a problem. I know said person forgetting the other person will cause no harm, nor is harm my intent. If anyone knows of such a spell, please let me know. Thank you!
I'm sorry to disappoint, but it is not at all likely to be able to control the memories of another person. That said, there are workings which might break a bond between two others, such as one particular Hoodoo working I've recently come across about separating a love from an attempting interloper. But you cannot alter someone else's memories.
no spell can wipe another persons memory, sorry. does this person want to forget, or have you just determined they should? [you don't have to explain] if you think it would be better if they forget, you're forcing your will over another person saying 'i know what's best for you' which is taking away their right to choose and therefore many see it as harmful. if the person came to you looking for a spell, while there isn't a spell to delete a memory, there are ways to come to terms with these things and work through them. it could be journaling or shadow work, if it's really hard, therapy.