Here is a little something that I've read .....
soulmates are referred to two partners who connect on an emotional and spiritual level. The relationship becomes more intense than a regular one. Their not just your other half but their the person who GETS you. If by trying everything your soulmate and you can't get together the relationship turns toxic and unhealthy. The intensity of the relationship causes fights, allow outside forces to interfere, shut each other out etc. which means it isn't meant to be in this life but maybe the next.
Even without marrying your soulmate a person can live a happy life. As the symbolism with the aarti scene. Prerna and bajaj destinies are entwined whether they like it or not. Certain factors will always make prerna chose bajaj. Such as trust, respect, loyalty, love and security. Bajaj has never made her feel any less. It's hard to imagine prerna letting go of bajaj.
Since marrying P bajaj has been a good husband. During the marriage preparations everything was done the way P would've wanted it. In Switzerland, he took her to beautiful locations despite her behavior like a good husband. During their arguments he is not afraid to correct her or walk away without explaining. He was there for her family and her in their time of need.
Now P has to return the same. As much as we hate this track it's to prove P loyalty. Who do you trust your ex or your husband? Who do you stand by your ex or your husband. Do you stand by your lover who've you always loved and known for years OR you stand by the man who've given you his trust INDEFINTELY, vouched for your family, respected you. The decision is not tough and hard. Although we know which one P will chose I can only hope bajaj wouldn't have to suffer through through many accusations placed by others and his wife. At this point I feel for bajaj truly. This is for audience to sympathize and like bajaj. Every dirty trick that is being played against bajaj is like he said very childish. Bajaj needs someone to lean on. He needs his wife. He needs support. Even if he doesn't ask for it.