ur dating wanderer through nahida, she got u two together and it worked out, he's tsundere and possessive bc he's been betrayed 3 times so he's scared of losing u aswell, he's got mommy issues not in a weird wayy (😭), he will literally knock out any weirdos or aggressive ppl, he was a Fatui in past so he still has his domain in sumeru and u live with him, u both told each other every detail of ur past so he trusts u 100%, he is trying to be a good bf, just not always good at showing it at times but, he just doesn't wanna lose u he's quite affectionate but in public he's mean to people and gets mad so u calm him down :) he was less aggressive than when he was a Fatui harbinger, he is possessive and protective but not SO over the top.