Originally Posted by Elly
In that same epilogue scene, Tav can also try to leave him, be told they can't ever leave, and walk out of the room with a heartbroken expression.

There are a ton of opportunities to break up with him and kill him. You can go with Karlach and Astarion won't stop you. It seems to me that if Tav stayed with him despite everything, in that moment he simply doesn't take Tav seriously anymore and thinks they're just trolling him. If you go for the evil ending, Tav doesn't use mind control on him anymore, further showcasing a point that if you go beyond a certain point, the game assumes that you do want to stay with him. There are no options to express your misery to the other companions during the epilogue party and ask them for help. Tav and Astarion can only bicker like a wedded couple.

Originally Posted by Elly
If Tav's expressions will depend on our choices, nobody would have to feel that way after Patch 7.

I doubt they're gonna bother to include that.