If I'm in the relationship, I'll communicate in some way. but people need space sometimes. I'm an introvert (social but recharge by getting away) and need time away to recover (because my girlfriend would stress me out and I her).
we both agreed one time to take 1.5m off, retry. It doesn't work without some kind of effort to produce change. It just takes the crazyiness down to temporaryily... all the underlying issues are still there. Eventually I decided to end it and that took 6+ months to achieve. The tentacles of relationships run deep.
I remember saying to her more than once... love is not enough... I love her (the her I perceive is there, the tender child in her), but I didn't like her and the realtionship (the junk and pain and negativity... etc...). It was too much for me, in my state at that time to handle.
Men often take awhile to process how they feel, they aren't really good at that feelings processing thing, unless they have been trained by self or by someone else. If he needs weeks of alone time, it could be that he's moved on if this is a regular occurrence and he just doesn't know how to tell you with out it leading to conflict.
Because, all the feeling and healing crap gets tedious very soon. I don't buy it when folks say girls want that all the time. Alone time is healthy. Gives guys time recharge their batteries and review their relationships.