Logically it seems to me that over time the ability to communicate with people SHOULD IMPROVE GET BETTER. When it doesn't even remain at the same level but deteriorates one wonders what the he** is happening?
Marriages break up because people just get tired or weary or bored or argue ceaselessly. The magic is gone. All that's left is detritus.
Well friends/friendly acquaintances probably experience the same dam* thing. You get bored. You get weary. You get tired of it. The exchanges seem to be contentious. So you move on because who wants to waste time being bored weary tired contentious?