Would it make you mad?

My sons dad, his girlfriend, and I get along great. I don't mind posting pictures of my son, his dad, and his girlfriend when I think it's a cute pic and my son looks handsome! Because I love that my son has two happy homes. He's so loved. But my current fiancé got upset and says that I'm wrong for posting a picture (one picture) of the three of them. In my head, it wasn't wrong. I was acknowledging how happy my son is and how happy I am that he has two homes. Would it make you mad? It wouldn't if it were reverse so that's why I don't understand. I feel very fortunate to have the relationship with my sons dad and his girlfriend that I do. Let me know what you think. 

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