"All right, let's talk. Who knows when we will have another chance?"

His behavior is carefree and a little superficial as usual. Despite the madness of this world, everything is quite well in your relationship. That is why your words about the need to break up are so alarming to him.

"Oh, shit. I... Did I do something wrong? Why? What's changed?"

No, he's definitely not ready to lose you. Not now or ever. Astarion may be arrogant and more selfish than anyone, but that doesn't mean he doesn't love you.