There are no rules for friendship. It must be left to itself. We cannot force it any more than love.

Friendship does not run on obligation, and effort alone cannot produce it. You can be available, you can be good company; what you cannot do is make someone want you in their life on a schedule. Trying to enforce it, by keeping score of calls or pressing for more closeness than is there, tends to push it further off.

Offer without conditions this week: a message with nothing owed back, an invitation you will not resent if it is declined. Then let it sit. Most friendships that last were left room to grow at their own speed, and the ones that do not take are not a failing in you.