1. Arti always get humilation, insult from her ex-husband , so when she come in contact with yash and get compliment, respect and care then she fall but in case of yash, if he give love to his ex-wife the he also get love, attention, care in return and she never cheated him. So it is not easily for him to fall in love so easily.
2. Most important, cv's try to show that love can be happen anytime with anyone but it is not necessary if u r in love again then u forget ur past love but u move forward.
3 just imagine if yash loves his ex-wife so disperately then when he loves arti, he fight with everyone for aarti support.
Yash take more time to fall bcoz his past is so beautifull and loving.