What would you do? Future mother in law edition

Briana

I’ve been with my boyfriend now fiancé for six years now. He is from Europe we met in college, and for the last few years we’ve been doing long-distance. He spends a couple months here and I go visit him there. He’s the most perfect man for me. My family loves him he’s really everything I could ask for. Due to language barrier I don’t talk to his parents all the time, but I do put in effort. We've had his parents stay with us and my family. Always include them send pictures gifts messages keep them involved as much as possible. I've always wanted a loving relationship with his parents. And I've always felt welcomed and loved by them. Welll... this month we got engaged!! I was so excited over the moon! All my family over joyed happy for us. He let all his family/friends know and everyone is happy for us ....... everyone except his parents..... we FaceTimed them to show the the ring and she didn't even pay attention changed the conversation to her Netflix show. No congratulations no acknowledgment.

My now fiancé brought it up to her attention letting her know how disrespectful her behavior was and expressed his anger. It was supposed to be an amazing moment now ruined. The days to follow things. Cooled down a bit and he spoke to her again. She said he has to understand her now she will never see him because he is moving to the US . He stands behind our relationship and love saying this is what he wants and he's the happiest with me. But she keeps saying things like " now I don't have a son" and how he's leaving them forever " and on and on .. my heart hurts for him because such a special time in our lives and his mom is acting this way. So what would you do ?