OP you are a controlling POS and yes your wife is cheating probably because you are abusive with her. Divorce her so you can go be alone and your wife can actually have a non-abusive man in her life. Get some therapy. You need tons of it.

Hey sister scrolling through Reddit just wanted to say I think you are a complete loser piece of shit and I hope you realize what a horrible mistake you are making acting this way towards your sister and abusing her. You family are a bunch of loser assholes and you deserve so much better OP. If you have anyone else in the extended family to reach out to I would find a way to get out of there ASAP.

TO OP - HAPPY BIRTHDAY YOU BEAUTIFUL GIRL!!!!!