My daughter has called her mom's husband daddy

Me and ex wife got separated and now divorced about 6 years ago. My daughter was 3 at the time and my ex's husband came into my daughters life when she was about 5. Last year my daughter told me that she called him daddy, same title I have been honored to have. He has more kids of his own and my daughter said nobody told her to call him dad, they told her that she could call him whatever she was confortable with. So she choose to call him daddy. He is a good guy, I get along with him very well and he loves and treats my daughter as his own. When my daughter told me, it hurt a bit but I was also happy because I knew she loved him and they had a good relationship. After a long convo with my daughter I told her that was fine, it was her decision.My parents and some friends have told me that I need to talk to my ex and him and not allow that, because I am her dad and I should be the only one to be called daddy.My view is that, she knows who her real dad is she is not confused about that. That is a title in my eyes thar he has earned. To me being called dad or daddy is an honor.What do you guys and gals think about this?Edit: we have 50/50 custody she spends half of the time with me and half with her mom equally. via /r/Parenting https://ift.tt/2P65iZk