away goal rule
those who scored more goals away wins
so lets say your second match was 1-1, your opponentd win because they scored 3 away as you scored just 1. if it were 3-3 the matchll go to overtime and the away goal rule isnt in effect. youll go into penalties if you draw after overtime. most cup finals and 3rd/4th place have a single game rule.

every football game includes this rule.