Guys, how easy do you find it to communicate your need for space, to your girlffriend?

My boyfriend goes through phases where he isn't very communicative, sometimes he could quite happily go days without texting/calling. This tends to happen when he's stressed, ie at the moment he started a new job a few weeks ago and he seems to have completely distanced himself from me with no indication of when we will next spend time together. Up until he started the new job he was so affectionate and looking to spend time with me.

if you needed space in your relationship how easy would you find it to broach that subject with your girlfriend?
Guys, how easy do you find it to communicate your need for space, to your girlffriend?
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