Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 10 months ago

Bismihi ta'ala

As we know, marital betrayal of this kind is a serious problem and a grave sin. Froma fiqhi perspective, she is still married to her husband, and although she committed zina, her marriage to her husband is still valid. She does need to repent, but she does not need to remarry her husband. 

And Allah knows best.