To be fair, we all grieve differently so the way my DH grieved when his mum died would have no bearing on the way your DH will grieve.
My DH lost his mum 2 years ago to alzheimers. He tells me he did his grieving long ago as it wasn't his mum in the end, it was just her shell. He lost his dad 9 years ago but they weren't that close so after the initial period of shock seemed to get back to normal pretty quickly.
However, he lost his brother to suicide in April this year and this has been the real battle.........he does talk about him a lot, he will cry about him a lot and anything can trigger it, a film, a song, or just anything. I let him take the lead to be honest and just go with how he is feeling.
When my mum died I tended to push people away, didn't particularly talk about it and if I wanted to cry would rather shut myself away and cry on my own so yes, I possibly pushed him away.
Grief is a strange creature so try not to take anything personally at the moment, he is probably all over the place.