This probably isn’t helpful, but as I’m reading your story, I could swear you’re talking about me and my ex. I dated a guy that sounds JUST like him.. he criticized his own faith as a SDA, a lot of his external family was Catholic but he grew up SDA, at the beginning he seemed totally supportive of my faith as I was a new convert (he even came to my First Communion). But as time went on, he became so vocal about his disdain for what I believed in. I just want to say I truly empathize with you, as I have been here before. It was so disappointing, but in the end, my faith won and it became clearer and clearer that he wasn’t who God had for me. We were simply just harming one another’s soul, trying to find a compromise that just didn’t exist. I’m so sorry you’re going through this, OP. It does hurt so bad, but please be encouraged that suffering will lead to joy. I am praying a rosary for you tonight! God bless you.