The context of the following conversation is They were only apart for a few minutes, but Aubrey missed Sydney already.:
Aubrey says We've only been apart for a few minutes, but I misses Sydney so much I ended up crying!.
The friend responds It's ok. Tears aren't all bad..
Aubrey responds It's just so sad! Why do I always miss Sydney so much? It's just so sad we can't always be together!.
The friend responds It is sad. But it's part of life, too..