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Administered from British India, the emirates developed commonalities with South Asia.
Trucial Oman (now UAE), was nominally independent in the 19th century but was administered by the British Raj; trade and banking sectors in the territory were administered by the Khoja and Kutchi communities of India.
In 1853, the rulers of the emirates signed a Perpetual Maritime Truce with the British, effectively bringing the region under Britain's sphere of influence.
TLDR version: Yes, there are unmarried couples living together in Dubai.
You can live together with your boyfriend or girlfriend, meaning it is possible, not permitted, just as it is possible to do many things that are illegal in different countries.
Many unmarried couples do live together in Dubai and the UAE without resulting in problems with the authorities but arrests can and do happen (more often for having sex in Dubai outside marriage than cohabitating).