Some push-comes-to-shove love

Can you please explain this expression?

I fell for her like some loose shingles from our Spanish roof and I'm going to love her until she loses every last root and has to glue dentures to her gums to chew solid food. Ooh, now that's real love, dude. That's some push-comes-to-shove love, not-when-it's-convenient love, hospital- bed love, feed-her-ice-chips love, never-leave-the-room love, sleeping-in-the-chair love, pray-to-up-above love, have-to-pull-the-plug, miss-her-in-my-bones love, everything-about-her love, die-within-a-month love, can't-live-without-her love. Love, the only reason that we are alive and none of us should have to wait until we're 85.