The SU community is abuzz with the new Season 1 DVD coming out! There's a clip straight from EW above, but here's what Sugar had to say:
"It wasn't until this version where I finally realized what I was trying to talk about, which is when you've tied yourself to someone so much that to lose them is to lose this big piece of yourself. The way it just feels like you're dragging this empty piece of you with you. I think that's the thing I had to realize, is that she's angry at herself. She wants to be better than she is. She's really just mad at herself."
Rebecca Sugar explains Pearl's heartache in Steven Universe: The Complete First Season clip
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