Merthur is real because you can see that in their eyes. they care about each other maybe too much at this point: they would literally DIE for each other. Arthur notices how Merlin doesn't smile for three days, whispers his name, and talks about living together with him to his wife?? and Merlin is doing everything to protect Arthur even though he's quite an ass sometimes.
i've never seen such glares and glances full of love, adoration, and such eagerness. they are really two sides of the same coin, the way Merlin can feel Arthur and vice versa, the way they goas each other. old married couple energy.

















