Hi and welcome!
Your LDR situation sounds a bit similar to ours. I too have at times lived closer to one of my partners and other times closer to the other one. I think it's important that you realise that you and C communicate better online, so for you two the long distance thing might not be as big an issue that it is for you and S. It's good to recognize the differences in the relationships and work on them on their own terms.
Me: bi female in my 30's
Live-in partners: Hank and rory
Exes that I might talk about
: Zooey, Ray, Sol, Evan, JJ