But Peter couldn't get it right all the time...And we all know that after that, Paul was assigned to the Gentiles while Peter was given the Jews for his ministry...
One compelling biblical fact that points clearly to Simon Peter’s primacy among the 12 Apostles and his importance and centrality to the drama of Christ’s earthly ministry, is that he is mentioned by name (e.g. Simon, Peter, Cephas, Kephas, etc.) 195 times in the course of the New Testament. The next most often-mentioned Apostle is St. John, who is mentioned a mere 29 times. After John, in descending order, the frequency of the other Apostles being mentioned by name trails off rapidly.
In Acts 10, Simon Peter receives a special revelation from God that Gentiles are to be welcomed into the Church without having to follow Jewish Kosher food restrictiions or undergo circumcision. In Acts 11, he acts in the name of the Church in welcoming the first Gentile converts to be received according to this new revelation.
But, as a Sola Scriptura christian, you already know this.