GAL, by yourself. It isn't called GAL and text BF to see if he wants to come. This is to be good to you and I get that you want your BF back, we have all been exactly where you are.
But, if you do not do the work on you, start looking at your own life and issues, then if he did come back, the problems would all resurface because you would deal with them the same way.
Put the phone down. I f he wants to call you he will. I would not have issued the invite, it is a lot of pressure. Also the "I love you"
You have no idea what is going on in his head. If he says no to the party then that's the indication, that's the magic eight ball answer? Really? That's what we call a dealbreaker and that is the pivotal point on which you say you're done?
Zero R talk is fine. It's been a very short period of time
Your emotions will bounce around, that is why most of us recommend a physical GAL, very physical, running cycling etc etc. It stops all those thoughts from cycling. You can do this.