Demi Lovato has one rule when it comes to exes – let them go! The I Love Me singer, who dated Wilmer Valderrama, and Joe Jonas recently opened up about why it’s important for her to cut ties with the people she is no longer with. “I kind of used to have this mentality that if I had a negative experience with someone, I always needed to mend it or I always needed to make things right,” the 27-year-old told Jameela Jamil. “The fact of the matter is, I’m not really friends with any of my exes today because I had to realize that that wasn’t healthy either.” Demi continued: “Now that I’ve been able to fully let go of people, you know, that is another thing that I had to learn when it comes to cutting toxic people out of your life -- if they’re