My auntie died a long time ago but I still miss her so much and sometimes I still cry like my heart is breaking all over again. Someone said to me that wasn't normal or healthy and that it was probably just my depression. I think it's normal to miss someone who was really special and important in your life, especially when things are rough and the person you need most right at that minute isn't around any more.
Of course it is, totally normal. If anyone tries to tell you differently, they don't know what they're talking about. Grief is not something that ever goes away. You just learn to accommodate it so you can move forward in your life and over time it gets less intense, at least most of the time.
Either they have never lost some one they love or they have never loved someone they lost.