Boyfriend 29M ignoring me 28F during passing of a family member

My grandfather passed away this morning and my boyfriend has been pissed at me since yesterday because I "overstayed my welcome" at his place and he wanted to be alone. I left his place yesterday when he asked me to but I returned that night just to check up on him and I knocked and all his lights were off and he didn't answer so I went home. Today I found out of my grandfather's passing and I went to his house because I was upset and wanted to talk. He wouldn't let me in and afterwards he blocked me on some messaging apps and instagram. He has been smoking weed for the past month and has been asking for a lot of alone time. He doesn't do anything while he is on holiday from work and we don't go anywhere. He smokes weed, gets drunk and plays games on his computer. Sometimes he is so wonderful and attentive and we have thh best time. He bought me some very expensive bags as a Christmas present(even though he wouldn't come to my family lunch) and then he blackmailed me afterwards saying how he provides me with everything and I am ungrateful and disrespectful (because I don't behave in a way he wants me to and don't "listen to him". He promises that we will go somewhere and we don't or he cancels last minute. I am so devastated today because of my grandfather's passing and all I wanted was for him to talk to me but he didn't even comment on it and he was very cold and told me he doesn't wanna see me. I really don't know what to do I'm so depressed and need some support but I'm not so close to my family and we don't speak openly. I have been with him for 5 years and this is how he behaves when I'm going through a tough time I really have no words for this cruelty and now it seems that I will spend nye alone since we we supposed to go out with his friend and his girlfriend and all of my friends are out of the country and I literally have no one by my side. How to move on from this?