Senthill Kumar Arumugam, 31, accused of fatally stabbing Meena Narayanan -- his bride-to-be -- was wracked with guilt after having premarital sex with his victim, Courier Mail reported.
He was charged with murder yesterday.
Arumugam first met his alleged victim, a fellow Hindu, on an Indian marriage website, the paper said.
They met once in Singapore where they had sex - but the pair reportedly became depressed after the fact because they knew sex outside marriage was culturally forbidden for Hindus, it added.
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He is accused of stabbing Narayanan multiple times in the abdomen, covering her face with a pillow, and slitting her throat.
Police, called to the hotel after staff heard high-pitched screams lasting up to three minutes, had to force their way into the room to find Arumugam, who had allegedly sustained self-inflicted wounds.
Arumugam was taken to hospital for his injuries but yesterday made a brief appearance via audio link to Brisbane Magistrates Court.