“It’s too hard to go from intimacy to pleasantries.”
Maybe it applies to this relationship (or maybe it doesn’t), but I don’t think you ought to put this blanket mindset on all of your past romances. Because sometimes it works. And working out the kinks to get to the promised land of post breakup friendship can be worth it. Don’t give up until you realize it’s impossible. You may have more emotional capacity than you think.