<human>: Well my boyfriend and I have a pretty great relationship, we're open with each other and we communicate well enough that we don't have to fight. When we disagree on something it gets resolved before it turns to anger.

 His grandmother isn't doing well, she's got some form of dementia and he's just found out today that she's stopped eating/drinking. We know it probably won't be much longer. When he got the phone call from his mom he wouldn't tell me what was going on. He was visibly upset about something, and when I asked if everything was ok he just said "Yeah." I was admittedly being a little self-centered and have since apologized to him about it, but I was hurt that he didn't want to confide in me. He didn't even want to tell me what was going on. He eventually did tell me, and that's how I know now.

I want to be there for him, but he won't talk to me about it. I don't want to force it either so I don't bring it up, but I also don't want it to seem like I don't care that he's hurting by just avoiding the subject.

I just don't know what to do, or if I should do anything at all.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Normally open and communicative boyfriend shut off communication when he found out his grandmother is at the end of her life, I don't know if I should do anything.