Does a man have to inform his 1st wife if he marries a second woman?

Re: Does a man have to inform his 1st wife if he marries a second woman?

I once met a couple at a wedding about whom my cousin whispered to me that the guy had a second wife whom I had thought was another family member of theirs. They seemed happy and both wifes seemed to like each other. It is said in that strange case, it was the first wife who had said for one reason or another he could marry anotehr wife!
Personally, I could never be with a married man, I could never share him, not even as his first wife, I would want to be the only wife. I don't know, it seems weird when I think about that threesome I had met, even though it was halal.

My friends exhusband used to try to provoke her, by saying he would marry another woman and she said: 'Well, go ahead, you do that, then I will have a sister finally (she has no sisters) and I can go shopping with her!' That shut him up and he had to come up with something else to nagg her, lol!