Grief is complex. Its not the same for everyone or for each person you grieve. I cried a lot at my Grandfather's funeral but not since; we weren't especially close. My other Grandma and I were very close. I didn't make it to her funeral and I didn't really cry. I slept a lot and kept to myself for the first week. Grief does have it's waves and sometimes they come when you don't expect it. I've had to text my BFF (who has really had her share of grief) in the middle of the grocery store because I couldn't stop the tears once. She just reassured me that's how it is. And I try to remind myself that the grief is deep because the love was deep. I have a good cry now and then when the emotion strikes but I also use that time to remember the love, the memories and lessons.
Be gentle with yourself. Don't be afraid to let other people help you through it.