Yes she might have even had a son from Jay ( I still hope not). But is the having a man with you just physically when he worships someone else , hen his heart beats for someone else good enough? The way she talks about Jay having Bani's love with him even if he is alone & her being lonely says it all. They might be living under same roof , in same room. May or may not have had physical relationship ( the way jay said sounds just once)
So she went as far as murdering people for what.
she behaved like dog in the manger. Didn't let Jay Ban enjoy what they had but didn't get what she wanted either. She & Pia failed to understand that certain things you just can't get by force.Poor Bani suffered because of that.