Friends eh. Imagine if everytime Joey Tribianni got a new girlfriend he disappeared for a couple of seasons. There would be no sight of him and the only reference to him would be Chandler Bing moaning that he hadn't heard from Joey for weeks since he'd been seeing that girl he met at Central Perk and Monica et all would raise their eyes in a typical of Joey kind of way.
We all have friends who suspend friendships during relationships. These people tend to be the people who only have short relationships because the new boyfriend or girlfriend gets sick of the sight of them because the Friendfuckeroffer has to spend every waking and sleeping moment with the new and now only person in their life.
When the relationship inevitably ends the Freindfuckeroffer realises why the relationship broke down and understands that the lack of space thing was a problem, usually apologises to friends for fucking them off and vows never to make the same mistake again. And this time they mean it. But then it happens again, maybe not as quickly as the time before but it's not long before Friendfuckeroffer is back to the old tricks.