Just for a better understanding and more clarification; you have always been the best of you to your partner and without offending them or doing anything but they suddenly go mute thereby leaving you to wonder what could be the reason why they’re mute on you. Finally, you pushed them to say something and all they could say is that people change and they have changed towards you. Please how possible is it for your partner to change towards you. You don’t offend them and you have done your best for their happiness.