If it was someone else hugging bhoomi he would probably not mind it - it is because it was suraj, the person who he thinks killed his brother. He hated him before the fire so it was easy to accept that saroj was the murderer.
I would like him to suffer a bit when he finds out. Bhoomi should not forgive him that easily.
As far as shefali is concerned, I am just waiting for her to get a divorce and than arjun find out the truth - that leaves her standing at the alter (if you know what I mean)
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Esti