Real friendship is a slow grower, and never thrives unless engrafted upon a stock of known and reciprocal merit.

Friendship that lasts is built slowly, out of evidence. You find out over years how someone behaves when it is inconvenient, and they find out the same about you, and the trust that results cannot be manufactured faster. The instant closeness that sometimes happens is pleasant but untested.

Be patient with friendships that are still forming and stop expecting depth from them yet. Keep turning up, keep being reliable in small things, and let time supply the rest. Meanwhile give some attention to the old friendships that already have the evidence in them.