Actualy Mumtaj was died at Burhanpur (M.P.) in 14th delevery....Funeral was completed at that time in Burhanpur....and also it is true that Shahajhan was absent for that...Even his dailly official record of his darbar...mentioned in that .. Shahajahan's one wife was dead...If Shahajahan's toleret this?....So Why we accept that Shahajhan buid Tajmahal in loveble memories of Mumtaj?
If you want to know reality about Tajmahal then you have read the book "Tajmahal Navhe Tejomahalay" by P.N. Ok (Pune)
Being a monarch was no joke. Whether you were Shah Jahan, King George or Chatrapati Shivaji. your daily routine was more than enough for you to forget your family. Even in modern corporate India, you have professionals in the middle of an assignment, who don't attend a sudden unexpected tragedy when it befalls them, and finish the assignment first instead. But that doesn't mean they hate or don't love their loved ones.
Maybe he built her the Taj Mahal because he felt so bad that he couldn't attend her funeral????
His case is very plausible.