I'm so sorry to hear that. Sometimes it just takes certian people longer to go through the grieving process than others. A lot of people often don't grieve until they go to the viewing/funeral, and that sets it off. Other people, it takes months.

When my mother died I didn't cry or anything, and I didn't even cry at her funeral. I was just like, 'whatever', and it wasn't until months later that it started to bother me.

You're just you. Everyone handles it differently.