We sit together but each of us is on our own phone. How do we repair this?

Being physically present but lost in a screen makes your spouse feel neglected even when you are right beside them. This problem easily drags on because there is no obvious argument, only a distance that slowly grows. Agree on a phone-free period every day, put the devices in another room, and give each other your full attention. When your spouse is talking, put your phone down and look at their face. Replace scrolling time with talking about each other's day or walking together. If one of you forgets, remind them gently, not sarcastically. Real presence is worth more than simply being in the same room. See communication & emotions.