When Regina pulled Snows cuore out she sad it had darkness in it, meaning Snow will one giorno be bad. Is that actually going to happen? Will Snow turn bad?

Snow made a mistake. But she didn't embrace the darkness, as long as Snow does the right thing from now on I don't think Snow will become bad.

In the show, it isn't as simple as a character being good o bad, a hero o a villain (one of the many things I like about it). Having a spot of darkness in her cuore is a symbol of how Snow has done something wrong o villainous. It doesn't automatically mean that she's going to become a villain. It doesn't indicate anything of a character's future.