death of grandma and break up with girlfriend

please excuse me for ranting but I don't think I can handle this anymore... my grandma recently passed away because of covid, she's the one who raised me and not my parents, she's the only one that I can talk to when I'm upset and I can tell her everything.. she loves saying "it's ok grandma is here" every time I'm stressed out or upset but now she's not here anymore, I just miss her so damn much and to add salt to injury, I thought my girlfriend would at least stay with me in my lowest point of my life but she's been distancing from me and ignore my calls and texts... we do have communication problems for a while but now she's not responding to anything at all for 4 days, i feel like this is the worst and least respectful way to breakup since it has no closure and I love her so so so much and it's hard to move on. I'm not very close with my family and this time my grandma isn't here anymore and I have literally no one to talk to, I'm usually a very positive person but as of right now life just sucks