I kind of got the same problem except me and my ex actually still talk to each other and are friends. We dated a total of 3 months and we had the best time together. The last month though I started kinda losing interest and started to spend less time with her. I still cared about her but school and work got in the way. So we decided to break up only if we could be friends. The last couple of weeks I have been missing her so much and she has a new guy friend. Sometimes I think I made a big mistake. So yea its true that you never realize what you had until its gone.