Suppose you want to get back on talking terms with someone, what do you tell them when they ask you..?

-..why you ignored them all these days?Say you were going through some problem and you just wanted some time out and some space and wanted to be by yourself.. Apologize..Just say that you thought they were doing the same. They'll probably ask why you didn't talk to them about it: You didn't confront them because you were afraid that they wouldn't want to talk. They might say they weren't ignoring you: say you felt they were mad.
Just apologise and say you thought that you'd give them some space or you were worried that they'd reject you.