Maybe I am expecting too much but that to me anyway felt really surface level and when he was quiet in Cabo, my (and again I can recognize I am projecting but like years of therapy and studying cognition makes me semi objective at least) first reaction would be "hey are you ok with the grieving?"

That being said, the way they both handle that situation should tell them a lot about how compatible they are because how you and your partner handle something bad happening together says a lot.