As a Catholic, there were aspects of Luther's life of which I was unaware. I didn't realize he was so scrupulous, with his multiple confessions, daily.
He was obsessed, with many things. No wonder he sought salvation outside the Catholic Church, since the Church had brought him torment.
I don't agree with his leaving the Church; had he stayed, he would likely be one of the greatest saints in Catholicism.
He may be a saint anyway, but there were a number of huge egos involved in the Reformation, on both sides.
He did not leave -- he was excommunicated. He wanted to reform the church. Historically, Lutherans have been criticized for retaining so much that looks Roman. This is proof, if any were needed, that Luther only got rid of unscriptural doctrines and practices and kept everything else that could be kept -- liturgy, the two sacraments, church fathers.