Its one thing to remarry after death but do you believe that it is right to have a nother ual partner?

I would have absolutely no problem if after i die my spouse found a new companion to travel with or be happy with but when i die i do not like thinking that she could possibly have another ual partner in a way i feel thats selfish but in another way i feel that its in a way like cheating or disrespecting your lost one. And than what happens if this eternal after life exists who does the spouse go to in the end..?