Fantasy அவன், அவள், புருஷன் (Completed - நிறைவு)

[Rangabaashyam]

மோகன் : "நான் எப்போதும் உனக்கு துரோகம் செய்ய மாட்டேன். கல்யாணம் ஆனபின் அவர் துணைக்கு துரோகம் செய்யும் ஒருவர் மிகவும் மோசம் மற்றும் கேவலமானவர் என்பது என் திடமான நம்பிக்கை." "அப்படி பட்டவருக்கு மன்னிப்பு கிடையாது."

When mohan first had doubt about his wife having affair, he was thinking a lot about what next including the impacts of it, society,  divorce and avinash. However, i have never seen anywhere that bhavani thinking about what if her husband finds the affair. What she is going to do. How a person involved in a deep affair and decided to get impregnated through other person be so relaxed.

At this point him tying the Thali is just a show for him. He knows it has no legal standing but it would make Bavani more in his grip and make her do his bidding. His ultimate aim is to impregnate her thereby establishing his dominance over his rival male. She is aware that all risk is hers only. If he abandons her she has no say in it. She wants a long relationship, even leading a double life if possible. However she is also cautious that her affair is secret from her husband and she can return to him wholly if anything goes wrong in her relationship with Bavani. That's why I said "she wants to eat her cake and keep it too' at the same time.

@Dumeelkumar
She is extra cautious and strongly believe that her husband cannot find anything. Vikram is helping her in all means to ensure this.  Even if something goes wrong in her relationship with vikram, she can still come back safely to mohan, if nothing is known to him. 
She might also feel like if there is going to be a separation after her affair is known, she can still start a better life with vikram. Either way She is not going to be affected in this affair and that is what keep her relaxed.