For me it's from "Brother Bear". Kenai's confession to Koda was just
Ellie & Carl's love story from "Up" is really heartbreaking too

The Lion King
Bambi
Up

I also find Pocahontas sad but beautiful at the same time.

UP

The part in Toy Story 3 when Andy says goodbye to the toys, I pretty much die.

Not a movie but there was a Winnie The Pooh episode in which Rabbit finds a little bird and takes care of her until she grows up and has to leave her. I swear I cried a river with that episode

OMG yes, I forgot about that one. I was almost in tears

This movie made me cry every time

When the old woman drops off Todd in the woods in The Fox and the Hound.

When they cut Rapunzel's flawless gold wig and winds up looking basic as fck

Toy Story 3 hit me hardest out of everything.

this..

I thought Frankenweenie was so depressing. I get too attached to animals though

Up

When Beast dies