Wayne Forrester, 34, told police he was devastated that his wife Emma, also 34, had changed her online profile to "single" days after he had moved out.
Forrester, an HGV driver, was drunk and high on cocaine when he attacked the mother of two in the early hours as she slept.
The day before the murder, he called her parents and complained about his wife's Facebook entry which he said "made her look like a fool", the court heard.
In a statement to police Forrester said: "Emma and I had just split up. She forced me out.
"She then posted messages on an internet website telling everyone she had left me and was looking to meet other men.