Most Helpful Girl
Because you're human and you have a heart. It's a chapter of your life that is over and you're mourning the end of something that had an impact on you. It can be hard to let go even when it's what you want.
Most Helpful Guy
I just broke up with my girlfriend of 4 years so i know how it feels. The reason you are feeling this was is the fact that you are a human being. The connection you built together can't just disapear like that. It would be weirder if you felt nothing at all. You feel like you still care deeply about her. You will hate it when you see her with other guys. But you can't say anything because you wanted to move on. Going to be honest you are gonna feel like shit for a while. But whatever happens be graceful about it, be there for her if she needs you as a friend no matter how hard it might be for you. Because everything you are feeling she's probably in the same boat. Ps do not even bother asking if she's moved on and slept with other people, trust me nothing good comes from asking that question.