I am wondering...

When is it a good time to call your friend and talk ?

Sometimes I think that they can be busy, and I don't want to disturb them, so I just send them a message.

Sometimes they answer right away. Other times they answer a day or weeks later. 

I feel like I am losing some friends little by little because we can't talk like we did before.

What I mean is: it feels like I am the only one who keep trying to reach to them.

Sometimes, we make a promise to talk on weekends, but I keep waiting for them.

The next day, they said that they forgot, have an emergency, etc.

I told them: "Don't worry. The most important thing is that you are okay. It doesnt matter, we can talk another day." 

And I am wondering:  When is the another day coming?