Maybe your heart is broken right now. Or maybe not. But if it is... Always remember your strong. You can still hold it together. And don't forget that you had a heart in the first place. So that doesn't mean it won't come back again.
A heart is a muscle. And you know what muscles do when their ripped apart? They grow back stronger. We all learn from mistakes. Learn from this one. Learn that you can get better. Learn that you can strive to find someone better. Because that is all that matters in the end. Finding someone who will love you forever. Even past the day you die.
Don't be afraid to use you heart again. Or in other words, don't tuck it away. Because you know what happens when you hide something? It gets lost. Now, would you want your happiness to be lost?