Line from the song "Bodies
" which appears on the second disc of The Smashing Pumpkins
album Mellon Collie and the Infinite Sadness
Literally, it means that love is death, death for yourself, death at your own hands. Falling in love with someone is akin to killing yourself.
Love being suicide doesn't literally happen very much, but it can often feel like it, especially when that love ends. It can end in many different ways, but one constant is that it hurts and sometimes that hurting never stops.
Linked to this is the Hedgehog's Dilemma, if love is suicide, if it hurts so much, why do we desire it so? Why is it that the pain we feel the most is of a broken heart?