I'll also inadequately give my two cents. I personally have a problem with the title alone (and don't feel the need to go further). I do not feel gaslighted by the game where Astarion's awful behavior is concerned. To me, it's quite obvious. That I am unable to address it, for technical reasons imposed by the medium, or because of more or less valid choices in the writing of it all, is another thing entirely (and at least not gaslighting in regard to his awfulness).