I feel like he should come back because that is the only way Anjali will see the truth. It will harder for Shyam to cause issues in the house as many already suspect him of doing wrong like Mami and Akash whereas Nani, NK and Arnav KNOW he's wrong. Anjali will also probably keep a better eye on him and anything that he did before that was suspicious, he won't be able to get away with it now. Arnav, Khushi and NK have no proof. They don't know about the papers being under the cradle so I feel it's best he comes back. He's going to be sneaking in anyways. Might as well be able to keep an eye on him.
If you guys noticed when Anjali woke up in the hospital and refused to believe she lost her child, she looked at Arnav and saw him broken, but she didn't believe it UNTIL she grabbed her stomach and realized that there was no baby there! She needed PROOF even then.
As much as I dislike Anjali's actions, I honestly understand her not turning against her husband. If tomorrow, someone accused Arnav of such a thing, would Khushi believe it without proof? Anjali loves Shyam and obviously it's difficult for her to see otherwise. She has built her happiness around her husband and that is a void that Arnav cannot fill.
I think she needs to witness Shyam's true self with her own eyes. I think that will make her a stronger person even if at first she breaks and I'm sure she will.
What do you guys think?
Also, Shyam coming back doesn't mean remarriage has to stop. Perhaps Anjali will push Arnav to have the wedding Khushi deserves!