The thing is if I was Tejo or my partner cheated on me I wouldn't ever get back to them. Yes, I probably will forgive them and try to understand where they came from for making that choice but I wouldn't get back to them.
But,if and when you forgive a person you do not use that to further put them down or shut them up in a fight or whatever. Either you forgive or you don't. And both are right. Tejo has all the right to not forgive Fateh ever but she has forgiven him yet her actions are such that Fateh is bound to feel insecure. Tejo's character is just hanging in the middle, so out of her character arc. Writers are shit that's the justification probably I can give.