Great love should make you cry. Because to love truly, recklessly, and beautifully means to open your heart up completely. That kind of true love can only end in tears, one way or another. Voicemails for Isabelle reminds you that love has to hurt.
The sad reality of living and loving is that we love people that we will eventually lose, or will lose us. Many great love movies discuss unrequited love or the agonizing pain of a breakup, but some even better ones explore losing a soulmate and finding another while healing.