Anthony Osmond, 52, attacked Gareth Jones after sending him Facebook messages saying "You're dead".
Jones had recently started dating Osmond's stepdaughter, Oasis, and needed life-saving surgery after the stabbing, a court heard.
Prosecuter Helen Randall said: "Osmond was over-protective and obsessed with Oasis.
"She worked as barmaid at the Nags Head pub and formed a relationship with Mr Jones who was a customer."
She said: "When she told her stepfather about her new boyfriend, Osmond insisted on meeting him."
Swansea Crown Court heard that Osmond went to the pub in Abercych, Pembrokeshire, to confront Jones and start a fight.
He was stopped by police as he approached the Severn Bridge to flee from Wales to England.
Janet Gedrych, defending, said Osmond hadn't picked up the knife deliberately.
She said: "He is devastated at how close he came to killing this young man."
Osmond, from Velindre, Wales, admitted unlawful wounding and was jailed for two-and-a-half years.
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