You used to be Jeans boyfriend, until you were knocked unconscious in battle and lost all your memory. The fatui took you in, and over the span of three years you become a harbringer, and you become best friends with Scaramouche. And then fell in love with Scaramouche, still having no idea who your friends, or Jean are.
Until they managed to bring your memory back and you joined them again, but you just couldn’t love Jean like you had years ago. Your heart belonged to Scaramouche now. But of course you never told them that.
Until Lumine and Scaramouche were fighting, with you, Jean, Kaeya, Diluc and Amber were fighting the abyss mages and hilichurls.
Until Lumine is about to defeat Scaramouche, with a flash of anemo vision your there blocking her blade, the bleeding Scaramouche behind you safely.
You quickly used anemo to teleport you both away, as you both land in some random cave Scaramouche falling on top of you.