I think it's about depression and suicide. He doesn't want to stress out the person he's with with his problems i.e. Your heart slows and I'll cry until you wake up. He loves her and is really dependent on her but he doesn't want to be. He wants to feel better instead, and wants to have his existential depression without upsetting his lover. I feel like this is something any artsy depressive type can relate to.
I think it's about depression and suicide. He doesn't want to stress out the person he's with with his problems i.e. Your heart slows and I'll cry until you wake up. He loves her and is really dependent on her but he doesn't want to be. He wants to feel better instead, and wants to have his existential depression without upsetting his lover. I feel like this is something any artsy depressive type can relate to.