"The most valuable thing I have learned in life is regret nothing."
Why regret something than once made us happy? It just wouldn't make any sense at all. If you dated someone and had the best months, even years, of your life, why would you regret it? It made you happy. Never regret anything.
You aren't gonna know everything all at one time. You learn more as life goes on, just like a dance.
"No one can give you better advice than yourself"
When you ask someone for advice, they're basically telling you what to do and how to do something. Why would you want that? Listen to your heart. Don't let anyone tell you how to live your life. It's yours.
Life goes on.