Okay here is one idea from my side...
Satish gets to know from his relatives that archu is married. He is like what... hw can that prostitute girl get married so soon, n he turns into a james bond detective type to find out who was that guy... clearly a case of curiosity kills the cat... also hears that they got archu married to him in a 2.5 crore grand wedding... his jaw drops down... 2.5 crore for that girl... maybe she wasnt bad after all... they wouldn't have spent so much on her otherwise even after knowing about her... guilt rises... finally comes to know the boy is a simple mechanic.
This is the limit... he shouts... got the pretty girl married to a mechanic in a 2.5 crore wedding...ek baar mujhe kyun nahin pucha... usme aisa kya hai jo mujhme nahin... archu's baba is so gaga over that guy... i look so much better than him... he isnt even shaved...i can get archu better quality umbrellas too... meri car theek karte karte meri to-be-wife ko uda le gaya...nahin....... turns into devdas... clear case of jealousy + superiority complex + sour grapes... decides archana meri hokar rahegi.... i'll show im better tahn that mechanic.. ha ah!!
And lo-and presto... enter satish as a brand new negative character....