Show me the dialogue where Minthara explicitly forces you not to break up with her, so you can't refuse. I did refuse relationship with her in my own playthrough.
Otherwise, considering that Minthara is still VERY bugged, it's not in the narrative itself, it's just a missing dialogue choices. Which, obviously, should be fixed.
That's ignoring a lot of in game content to try and flatten a character and his story to fit a single, very one dimensional narrative.
That's exactly what you are doing as well, though.
You are ignoring a lot of instances where the game gives players legitimate reasons to interpret it as abuse. You ignore:
1. Spawn admitting he "wanted to be just like Cazador".
2. The narrative where Tav is not allowed to break up with him
3. Dev notes calling AA's line "abusive"
4. Parallels to repeating the cycle of abuse shown in the scene with Vellioth skull.
5. A lot of AA dialogues where Tav can call him out on being the new Cazador.
Just some examples off the top of my head. Obviously, it's far from all of them.
But most importantly, you ignore all the new romance banter, where companions see Tav/AA bond as abusive. But somehow nobody is asking Larian to take this away from the game. Very strange. Because if anything, for me companions' reactions confirm the abusive nature of this relationship much more than some Tav's facial expressions. For example:
Astarion: I have one person who trusts me completely. That's enough for me.
Karlach: Treat them right, or you'll have me to answer to.
Astarion: As the Vampire Ascendant, I can grant my lover immortality, and bind them to me forever.
Gale: I trust you speak of the bonds of love, and not the shackles of servitude.
Wyll: You had the most precious thing - someone who would do everything for you - and you damn well took everything. 'Degenerate' doesn't half cut it.
Astarion: Oh, I've never had trouble attracting foolish, pretty people.
Jaheira: Nor did Cazador, it seems.
Halsin: To give oneself wholly, and to have a lover totally in your thrall...? A harmless game, until it becomes real. I worry for the two of you, Astarion.
Halsin: For your sake, I hope some of it is just a fantasy, deep in your heart.
Almost every companion expresses their concern for Tav's wellbeing under AA's control.
If companions interpret this bond as abusive and unsafe for Tav, the player is also allowed to interpret it just as well as they do. It's totally legit and this is in the game itself. Like it or not, if you really don't want other people to see this relationship as abusive, you need to ask Larian to completely rewrite the whole AA/Tav relationship. Otherwise we are completely valid in our request to have an option to choose to play it as we see fit.