why am i so defensive ?

My fiancé approached me an issue and i feel like he had done a good job of doing it in a loving way. but i got embarrassed and then got defensive and it turned into an argument before bed for like an hour when the real answer was prob just to respond in a more loving accepting way on my end - to be honest, im worried no matter how nicely he approaches something i feel like i will always be defensive. what can i do to stop?