My bf’s mom died, it’s been so hard lately

Has anyone dealt with their SO’s parent passing away?

I’m trying to be there for him as best I can. We’ve been together almost 4 years, I am 28, he is 30.

It’s been a month so it’s very new, but this weekend is his birthday and his emotions have been so up and I down. I’m not sure if I will even see him, he seems to need space sometimes and other times doesn’t. i’m trying to be understanding at every turn, and not be reactive. i love him and feel so terrible for him but I’m so tired. i guess i feel alone in this in a way that’s new to me, i guess i am just looking for any advice, thank you for reading all of this.