When someone has exceeded the comfort level of their significant other when it comes to
together time or being
accountable for where they are and what they have done.
Think multiple calls daily to
check in or see whats up.
I know thats not really a useful description. But its going to be highly variable depending on the both the individual involved and how into each other they are.
Some people like to move into their BF/GF's ass and take up residence. Some people really like that. Others not so much. It can make it uncomfortable to move around . . .
Also, some people will allow or encourage more clinginess in the beginning when things are new, or when they like the other person more.