Shekhar's mind is so much full of all the worries and the intense pressure of Loha singh as well as Siddheshwari that he does not realise this
And yes ppl
Do look at the positive side
Shekhar is a "Patnivrata Husband", however bad his wife may be.....
And if he realises Laali's love he might just Shoo her away or simply Avoid her fearing that he too might start feeling for her
So the later Shekhar knows what Laali feels, the better it is for Laali
Atleast She will be able to remain close to him
And who knows, they might end up being really Good Friends which Shekhar was never able to be with Siddheshwari