Born in Milan in 1896 from Anacleto Resega and Maria Allievi, he participated in the First World War with the rank of infantry lieutenant, receiving a Silver Medal of Military Valor for courage displayed during the battle of Caporetto.

Declared a war invalid for wounds suffered in combat, he was repatriated and on 5 June 1943 he was appointed federal inspector of the PNF in his native Milan.

According to Gianni Oliva, Resega represented the "moderate" faction of the Milanese Fascists, trying to curb excesses of the most hardliner elements, led by Francesco Colombo.

Nevertheless, his position as head of the Milanese fascists made him a target for the Gruppi di Azione Patriottica, and in the evening of 18 December 1943 he was ambushed and shot dead in front of his home by three GAP members.

Eight anti-Fascists were executed in reprisal on the following day at the Arena Civica; the GAP in turn opened fire on Resega's funeral procession on 20 December.