[Alfred may not know all the details of Oswald and Ed's relationship but he knows what love looks like, and he especially knows what losing a love looks like. He lost one a long time ago and never really forgave himself for it.]

That you loved him.

[He supplies and gently hangs the suit on the back of the door and moves forward to kneel down at Oswald's feet so they are on the same level.]

I don't know everything that transpired between you two but I can say this, I believe he knew. After all, you took a grenade for him back when we all stood together and you don't do that for someone you don't love.