Re: Is Divorce permissible in this case?
Yes 2nd marriage is an option but this time he would want to marry someone from his own tribe/caste. reason he has seen cross culture marriage and he is kind of scared now. He can find a gal easily, since he is young and financially stable but it would be difficult to have a gal of his choice who and whose family will accept him with his first wife. (many families would not prefer such an arrangement.)
Secondly, he says he wont be able to keep justice between both wives, which is required if he follows Islamic rule. He can provide her financially, but not more than that.