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Ask Tyrant Swain
I don't really want to argue this, but I'm gonna. GarenXKat...Not really. It is fan canon and STRONGLY hinted at in lore, but it isn't official. Is it likely....yes.
Actually, Riot disengaged that one with the Kat lore rework. I know there's a Runaan quote there somewhere saying that the GarenxKat thing is over, I'm just too lazy to fund it.
It's probably in the ''Kat lore rework AMA'' thread on Lore Discussion.