As the great Gwen Stefani once sang in her hit song 'Cool' from the early 2000s , 'time always kills the pain.' In our experience, this statement always proves to be true. If time doesn't kill the heartbreak over one man, then we would recommend getting under someone else in order to get over the man in question. However, that route isn't always emotionally healthy, and we would recommend depending on the passing of time as the first choice. If Queen Gwen says so, then it must be true. Twitter…