Spouse/partner annoyed with my grief?

I've been grieving openly and often. My spouse is in a different place due to other life stressors like lots of loss, stress, and grief for two plus years and now this.

So Partner isn't grieving as openly or often as me and they're admitting to feeling guilty. (There's maybe some resentment too, with them mentioning that "you're not the only one grieving) but also, I've never pushed anyone else's grief away or diminish it, just said I felt lonely after my loss... also, MIL made a comment the day before the TFMR that "she was grieving too" but again, I've never once done or said anything to the effect that I somehow have the monopoly on grieving my daughter. But I'm also so hurt by thier comments.

Lately, though, it seems as if my partner is annoyed with me when I talk about it or get really emotional about it. Or if I break down, the initial reaction seems to be annoyed. Then they're supporting and sympathetic, but it's like, still annoyed?

Idk how to support them, but I also need to be able to just break down and cry, and to be able to own the grief I am feeling? How can I help my partner? How can I be less annoying?

Any advice? Please help. I worry our relationship is getting strained b/c they are so resentful/tired/annoyed of my grieving like this.