I so often hear people make the argument that the opposite of love is hate. I have never found that to be true. If someone hates you, they clearly give a damn. They feel something and there is still a way you can reach them.
I find the opposite of love to be apathy. Apathy is indifference, that is, the removal of caring either way. Relationships, projects and dreams can survive almost anything except indifference. If you want to slowly kill something, "just" stop caring.
(P.S. My username has a typo. And Steemit won't let me edit it... whatever.)