Is he in the wrong? or am I..

so.. my fiancé and i have been together 3 years have a 1 year old together.. and we have been having current issues relating to family.. my cousin who rarely spends time with me or sees me (yet lives very close lol 5 min away) tends to be more affectionate that others you could say as we grew up together as little kids living together! one day while i was using the restroom he came in & just got in the tub & started washing his feet.. i said nothing and just carried on obviously still trying to be discreet. today he saw me and while i was doing the dishes he came behind me & started giving me hugs and said how he misses me he squeezed my cheeks after and gave me a kiss on both cheeks. this all infuriated my fiancé i just feel torn between both my family that i made and my cousin who i grew up with as a brother.. i can't help but feel confused af. is he in the wrong for getting so pissed and worked up over nothing? or am i wrong for letting my grown cousin act this way?

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