Did a married couple live in fornication if annulled? (Catholic)

I read here point 33. > **If a marriage is declared null, does it mean that the marriage never > existed?** > > Not exactly. It means it did not exist in the way the Church > says that marriages exist. A declaration of nullity does not deny that > a relationship existed. It simply states that the relationship that > existed was not what the Church means by marriage. If it never existed according to what the Church means by marriage does this make their previous "relationship" full of fornicating after the church declare the annulment? Does the annulment make their previous cohabitation full of fornications?