How to talk about it

So I've been crashing on a friends couch for the past few months and my birthday weekend his friend/girlfriend (they haven't labeled it yet) told him that he has till June 13th to either kick me out or she will no longer speak to him. My boyfriend who I've only been dating for 3 months now said I'm always welcomed at his place but I don't know how to go about the conversation to see if I'd just be staying there for a little while or permanently moving in. I've never had to had this conversation before and I just feel like this is the kind of thing that should be talked about before happening.