Friendships that warm up slowly usually cool down slowly too.

The speed something arrives at tends to predict the speed it leaves at. A friendship built over months of ordinary time has a lot of small anchors in it, so there is nothing to collapse all at once, while an instant closeness has only the intensity, and intensity is the first thing to go. Slow is usually a sign of something load-bearing.

Put your time this week into one friendship that has grown gradually. Nothing dramatic, just the normal maintenance: the message, the lift, the half hour after practice. Those are the anchors, and they are being set now.