Trouble with Halsin Epilogue

[trisket]

I know that Halsin has a romance epilogue at the end of the game where you can come back to meet everybody by his side, but it's not triggering in my game. I'm wondering if my romance with Astarion is causing a bug? For insight, I get Halsin's meeting in the Elfsong tavern first and I agree to go with him, and after that I get Astarions meeting (which I already thought was odd since I agreed to go off with Halsin). But I break up with him, go through everyone's cutscenes, and when I end up coming to camp, I'm coming in completely alone. I don't understand why this would be happening if I already agreed to be with Halsin and go with him. What do I do?