Yes, we all know arti's love for yash and her past and that pain she get from her first marriage but yash don't know. Yash never thinkh her as wife then how we wanted that he accept her. I know he loves her but cant accept it b/c he think love happened only once in the life. When he realised then he accept his love for aarti.
Yash accept arpita as his wife so for him this incidence is cheating from his wife. He is loyal to his wife and once he acceot arti as his wife then all is fine. Pls understand the yash pov. As soon as he comes out from his past as soon his life move in right directuon.
nowadayas, he blame arti b/c he thinkh arti pushy him to do anythingh but once he know his past and her pain then he support her with full of heart.