Suppose some friend of yours has invited you for a beer or whatever activity on a semi-regular basis, say about once or twice a week, on average. There's a change in his patterns; he doesn't contact you for two weeks or so. What you feeling?
Is he a traitor, cold-hearted bastard, has he abondoned you, etc.
Is it just normal thing with the time - sometimes time allows for stuff, sometimes it doesn't.
On a scale of 0 to 100, how much drama would you expect to be involved?
How about the responsibility? Would you make an estimate of his responsibility on based on the patterns?
How about some other scenarios where regularity of time together comes as an important factor?
Edit: if this is a more intricate matter, depending on circumstances, please explain.