“You will never be able to do perfect justice between wives even if it is your ardent desire. [4:129]” This is a reference from Quranic verse. I am sorry darling but Allah knows better than us. He suggested people to get married once only if you can’t do justice. The rights of 2,3,4 wives have limitations that are hardly met these days. Do not incline too much to one of them (by giving her more of your time and provision) so as to leave the other hanging. If men are marrying after lust, they are already doing a gunnah by betraying their first wife in regards to treating her unfairly.