When a male you are romantically involved with recedes into himself and doesnt let anything out. It is their way of dealing with how they're feeling or a problem they have. It is extremely annoying for the woman involved. Ladies, it is almost impossible to get a word out of him when he is acting like this so just leave him and they sooner or later come crawling back. But they do act like nothings happened which is also very annoying.
Beryl: Omg I'm so annoyed at Roger at the moment.
Beryl: He's gone into his man cave