Here is a weird thought experiment:
I cant Google this problem so I asked here.You have crush on someone ("A"). However, A was taken away and married to someone else. You are in extreme hopelessness and depression. However, memory manipulation was possible. your depression can be cured by erasing the memory about the love to A. (therefore you will no longer love A after the memory was manipulated). What are you going to think? Are you willing to erase the memory? Why? Is "love" preventing you to do that?