I mean, did you completely reject their advances in Act 1? If you did, I think that stops all romance dialogue options.
It does actually and I wrote feedback to complain about exactly that - all romance options just die after the party, unless Tav has already started something. As
Dark Urge
, if you make a certain choice this means that it will be impossible to start a romance afterwards, which wasn't really great. Especially when we KNOW someone (I've found two so far) really wanted to have a relationship with Tav but only backed down after being told Tav loves someone else. At which point they say "Fair enough" and never insist. I wanted to ... reasses ... the relationship after certain events but wasn't given the option to.
Adventuring is a hard life, sometimes people fall on a dagger multiple times, you know.
I honestly have no idea what the thread starter is talking about. I'm at 480+ hours played right now across 5 playthroughs I have NEVER seen them insisting after the party unless the player agreed to something. The only companion that is annoyingly forward but also vague is Gale, because he interprets any sort of attention as romantic interest very fast. I honestly don't mind, people like that exist and the game offers multiple ways to deal with it. If you're brutally honest (even rude) he will get it faster. Even Gale stops when told "X is for me". Yeah, it's not great that he's so immature (after being together with a Goddess, lol), but I see no issue with having a problematic character like that as long as it doesn't get too far out of hand (which it doesn't).
The game offers options on saying no to every single companion (ranging from "Yuck!" to "Sorry, I don't see you that way") multiple times. Do some of them interpret you taking great interest in their personal lives and putting aside the main quest of saving Faerun to deal with their personal problems as a sign of possible romantic interest? Yes, they do. Many people would at least wonder. Considering many of the companions have a very low charisma score... maybe we can have some understanding :P