If husband keeps you happy, would you let him marry again.

Gr8Heera, X2 and others.
I like to say something about Muttah. There are many orders from Allah in Quran that were given based on certain ground realities of specific time and later were taken back (MANSOOKH, Voided, Nullified etc.).

Muttah is one of them. It was allowed in prophet's (PBUH) time temporarily for Mujahids of Islam fighting wars for months away from homes. And it was, that they can marry a woman for certain time and divorce her after that time. But even in that, husband was still responsible for any children born as a result of this kind of marriage.

This was revoked later on and is not part of Islam anymore. Shia hazraat still practice this but according to Sunni Fiqah, it is not permitted.

Regards