I think Sid is totally confused. how? lets see :
first he didnt know to whom taps is married
then he didnt know where taps is : delhi, mumbai or US.
thirdly he threatens taps that he will tell evrything to veer but hides when veer enters the house.
so in short sid is confused about how to torture taps....uska kuch nahi ho sakta.
he needs to have a mentor like nani...to guide him in all his plotting n scheming. he comes with no plan of action.he wants to spoil taps life but is he doing nething for it except of threatening her? now i dont think he wants to balckmail her for money or something.....this cant be the reason.
so why doesnt he puts himself into action n does something which is really disasterous for taps...its high time now.