Terri-Marie Palmer, 23, fatally stabbed Damon Searson in the heart after flying into a jealous rage over his social media activity.
She then dialled 999 and claimed the stabbing happened accidentally when she threw Damon the blade at the caravan park where they were staying.
She said: "It's a carving knife. We literally only got it today. It's really f****** sharp."
But a jury didn't believe Palmer and convicted her of murder..
She then stabbed Mr Searson, 24, as he checked his messages.
She claimed she payed the rent while he spent money on a mobile phone and shopping and said she was planing to leave him and move back in with her mother.
In her post Palmer said: "All he does is sits there and adds loads of girls. He's a f****** little prick. I'm fuming with him."