I think I would sew in by hand a "foundation piece" (in the hole area--sewing the edges of the torn hole to the foundation piece) first to try to minimize the size of the hole and stablize the hole itself so it won't rip out any more..
Then, I would try to find matching (or almost matching) pieces to applique by hand over the hole following the pattern of the blocks.
If that isn't possible, maybe, applique a heart over the spot.
Good luck, I'm sure you'll do a great job.
(and post pictures when you're done...)