advice on ex's

Abigail
The day I went into the hospital to have my son, my ex messaged my sister, he said he knew I should be having a baby any day now and to please congratulate me for him and that I was going to be a great mom. I told her she could tell him that my fiancé and I said thanks. Then, I told my fiancé about it and HE WENT OFF. Once he calmed down he said he was over but if I ever communicated with my ex again, he would stay with his mom for a week and just visit our son. Recently his ex reached out to him telling him she finally got the ring at the bottom of a candle he got her and that he had a beautiful family. I was on his phone when the message came through, admittedly I was jealous at first and furious when he said he wanted to message her and thank her because he wants to stay true to his morals and believes in always being kind. I decided I was over it and I was fine with him messaging her back but I let him know that it was a little hypocritical considering what happened with my ex. He then told me that it's different because HES A CHRISTIAN AND IM NOT. Wtf.... 🙄 so when a mutual friend told me my ex's mom was in the hospital I told her to let him know that him and his family are in my thoughts. I didn't even tell my fiancé about it, is that wrong?