What's tu never know how much tu cherished something until its gone mean?

It just means tu didn't know what tu had until tu didn't have it any more, tu didnt' see it while tu had it, but once tu didn't have it any más tu realized what tu missed... So I guess it also means appreciate what tu have now cuz it could be gone tomorrow. :]

tu have to keep 2 things in mind:
1. We want what we can't/don't have.
2. We get easily bored and want the siguiente best thing.

When tu say that tu don't know how much tu cherished something until it's gone, tu mean that when tu own it tu do not fully appreciate just how great it is until tu no longer have it.

It might o might not mean that they cherish something more. It all depends on the context of the situation and just how fickle that person is.