(1) He has/had a relationship with Petronella Cornillie.
(2) He is married to Therese Cecile Ooghe.
They got married on May 2, 1804 at Zonnebeke, West Flanders, Belgium, he was 41 years old.Source 2
FamilySearch: Family Tree
Pierre Augustin Cardoen
Birth 6 June 1762 • Geluwe, West-Vlaanderen, België
Death after 1844
Parents Guillaume Cardoen • Marie Jeanne Meeerseman
Spouse Petronella Cornillie • Therese Cecile Ooghe
Lead confidence: 5
https://www.familysearch.org/tree/person/G4H5-ZDY