The speaker fondly remembers how it felt to be near his lover and longs for that feeling again. But he’s faced with the reality that, right now, they can’t be together.
It’s not clear what happened here: they could’ve broken up, but the music video implies his partner died. Regardless of what happened, Sam misses him.
He holds on to the possibility of being with his lover again, but the song’s tone suggests that this might not happen until death.