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So lbh definitely talked to sqq's corpse during those five years. Maybe he told his dead shizun about his day or his worries (both politically and in the dead shizun flavors). Though I think my favorite would be just talking about his feelings, especially since he never got to do that before everything happened (and honestly that could have saved a lot of time)
Cut to post cannon and Luo Binghe still has this habit, just instead of Shen Qingqiu being dead he's just sleeping. So some (most if not all) mornings when Luo Binghe wakes up before Shen Qingqiu he'll just sort of talk about things. It's usually a lot less emotionally charged since, well, sqq is actually alive, but still. I also imagine if there's ever stuff he doesn't want to burden sqq with knowing, he'll just end up telling it to him when he's asleep. Adding this with the headcannon that it took Bingqiu a long time to actually say 'I love you', I think that Luo Binghe would tell sleeping sqq that he loves him