Proud 'just snapped' when he bashed ex

Former Brisbane Lions player Albert Proud "just snapped" the night he punched his then-girlfriend in the chest so hard the woman thought she was having a heart attack, a court has heard.

Proud, 27, fronted the Brisbane District Court on Monday where he is being sentenced for one count of grievous bodily harm inflicted on his now former partner Richelle Kadadi, as well as wilful damage.

Crown prosecutor Joshua Hanna said Proud became violent after the couple attended a wedding and then a party on November 8, 2015.

Proud struck the windscreen and gearstick in the car before punching her so hard in the chest she thought she was having a heart attack from the "excruciating pain" when they arrived home.