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Alex Marshall, 37, of Irchester Road, Rushden, is alleged to have killed Fiona Marshall, 41, and Richard Flippance, 44 at Brampton Ash.
He then doused the Northants bungalow with petrol and set it alight in April 2006, Birmingham Crown Court was told.
The defendant denies the two counts of murder - and a third of arson.
Read emails
Prosecutor David Fisher QC said Mrs Marshall and Mr Flippance had met through an online dating agency about a month before they were killed.
He said the defendant, who had subjected his wife to domestic abuse, had learned about their relationship by "spying" on her after hacking into an internet dating account and reading her emails.
The Marshalls, who had first met while working together at Harrods in London, had a seven-year-old son and were going through a divorce at the time.
Mr Fisher said that the defendant had learned, by reading his wife's emails, that she and Mr Flippance, from Thame in Oxfordshire, would be together on the night they were killed.
He said: "The prosecution allege that Alex Marshall made his way to the bungalow knowing that it was highly likely his estranged wife Fiona Marshall would be there with her new boyfriend Richard Flippance who was staying overnight for the first time."
The trial continues.
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