The power this whole sequence holds.
Simon looking for a sign, something telling him wilhelm canāt just be indifferent and whatever mask he put on to act so friendly would break soon. When none of it happens, heās the one hit by the realisation that wille is giving up on them. It was never an option up until now but suddenly becomes very real, so it is strange and scary and leads simon back in his steps to ask why - why are you giving up? why do you not care? why are you not fighting back?
It feels wrong. acting completely unbothered when all simon ever wanted was for wille to fight for him out of love.
He invites marcus to the dance floor because he wants to be seen and get willeās attention, waits for him to act jealous and shows he cares, to feel replaced, to face the fact that letting simon go and be with someone else means losing him forever . . . without knowing that wilhelmās tears and heartbreak already helped him accept and come to term with this reality.
So in the end, it turns out to be simonās turn to learn that expecting something from wille only shows what he really wants instead, but tries hard to mask behind: he expects wille to fight because he still cares, heās the one who doesnāt want to be replaced, he canāt let wilhelm go, he doesnāt want to move on.
That moving on is not an option.