My gf of 5 years and I broke up about a month and a half ago. We had a mutual break up because things were just not working out. Over the past month I felt great. But yesterday I was driving to my friends house and all of a sudden and out of nowhere my ex cane to my mind and I started to get worried and nervous and just very very worried. Eventually it went away. Anyone knows what it means? Has it ever happened to anyone?