"interactions with Core have gone so poorly that they were adversely impacting my mental health"
That seems a little more serious than "could be proactive about comms" especially when this is one of the key people responsible for a lot of the original Pebble tech, rebble tech, and working within Google to get the Pebble OS open sourced.
I think unfortunately this is a normal thing that happens: passionate people get very attached to something and have trouble dealing with dispute even when everyone is relatively good intentioned. I've seen it in the workplace a dozen times.
That seems a little more serious than "could be proactive about comms" especially when this is one of the key people responsible for a lot of the original Pebble tech, rebble tech, and working within Google to get the Pebble OS open sourced.