There can never be proper relations with Protestants because of Mary in terms of unity. We can be respectful but the errors are very grave. There is a lot in common but Mary is a real obstacle and the bits we don't have in common are very, very serious. One example will suffice - all protestant denominations hold that the Blessed Virgin Mary was a 'sinner'. They believe Mary was a virgin and Blessed but deny her Immaculate Conception. The Immaculate Conception appears to be a bridge too far. Protestants insult Mary by calling her a sinner.