This change can be anything like a change in perspective, thought, action, request etc. And can be something within yourself, a change you both started doing together, or maybe something your partner did that allowed you to open up, expand, grow trust, &/or change the way you connect with each other?
For me, I started bringing issues up when my nervous system was more regulated, instead of dumping all my fears & emotions on him whenever i felt them. This way, he would also feel safe & calm to actually listen to my words instead of reacting to my nervous system & emotions. Lots of work on my end, but it seems to be helping our communication.