The "Roar" singer admitted that she did a lot of work on herself, too, telling Ellen DeGeneres that she found her strength and was able to work her way out of the dark place with the help of meditation, therapy and vitamins.
She also gave up alcohol for three months following the split in order to help herself heal.
So, now that she's done all of the self-reflection and made the changes she wanted to make, what could she possibly commit to for her New Year's resolution?
"If I need to change something, I feel like I just change it," she said, while answering some caller questions on American Top 40. "Like, I just make the change that day. It doesn't have to be the pressure of January 1 because it feels like you're setting yourself up. But you know, you do you and I'll do me!"
That's actually a really good point...there's no time like the present!
Plus, it sounds like Katy has been pretty good about keeping those promises she makes to herself no matter what time of year it is!
Do you have a New Year's resolution this year?