My wife has either in the past had sex with her step dad

When it comes to holidays and such my wife seems to go all out for her step dad and never for me. Christmas and birthdays I get a card or nothing but him she goes all out and buys all kinds stuff. Last winter I needed a jacket and while shopping all I heard was oh he would like this or oh he would love that and do they have it in XXL? To the point I was like damn who we shopping for and nothing for me on my birthday and week later fathers day I get a card and he gets balloons,card and other gifts. And she always makes a point o Saturdays to be at her parents house before 7am or else she gets pissed. Both of us are smokers and he is not and when over there which I'm not allowed anymore she either don't s.oke or maybe 1 but when not there she smokes like a train and it causes a fight cause I have 1 lung and hard to breath . I ask her why she don't smoke like this there and she says she don't wanna disappoint her step dad and any time he's talked about he walks on water. I straight up asked her before if they have ever fucked and holy shit it hit the fan and she left to go out to her parents house conviently and blocked me on social media and blocked all my calls and text. Personally I think they still are cause when ever I'm around now he has a smug look on his face.