Is it normal i feel nothing in a 1 year relationship?

To understand the situation, I will need to say I lost my gran last year and she was my best friend and I miss her everyday. I love my boyfriend, he's caring, he spoils me rotten even if I ask him not to, we go to his parents for lunch in a Sunday and they are so lovely aswell, we go places and just generally enjoy his company. We were friends for 6 years before we got together and he had liked me for a long time before. When we got together it was great, I got butterfly's whenever met up. 1 year in and he's talking about moving in together, Ive lived with my mum and gran since I can remember, now it's just me and mum.

We haven't had set in a month or so coz he really hurt me down below had to go to doctors etc everything is fine. But he reacted so strongly at Xmas with my family, he went mad when he had a bit to much to drink as i was really distant as this was the first Xmas since gran passed and it was so hard, he was having a laugh with my family etc then he snapped when I wasn't talking to anyone much. (when I get upset I kind of shut downy emotions to keepuaelf from crying everyday) he kicked off called me a bully etx for ignoring him, even through I had warned him in advance I was going to be off and to just carry on. He rude and swore at my mum and still hasn't apologised etc I've explained I'm upset about it bit he's very forgetful at times.

He doesnt seem to care etc about the sit and he's forgotten it or moved on but he's so lovely to me and him and mum seem to be on getting better, but for me things seem to be dying down. I do love him, I can't tell of its just my grief for.my gran and I can't feel much anymore. Last time we had sex i felt nothing. But I don't know whether to let him go and break his heart or to give it time as I'm still grieving. My mum says to give it time. But I just don't know, I'm in my 20s BTW.

Help!