My SO lost his brother

My boyfriend lost his brother in Aug of 2018. We broke up in May of 2019 and have been on and off since then. We just got back together in Dec. of 2019. He still is dealing with the loss, understandably, but what are some thing I can do to help? Any advice? (BTW he’s not too much of the talking type but when he is, I tend to be at the loss of words cause I’ve read up that saying “I’m sorry” and things like that can be annoying to him, so I’m really asking for help)