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Wrong bro, it's twice no team can ever meet three times in a league game in a particular season, it's always twice. The first game you talked about a pre season game and isn't in a way a competitive match. They have met just twice so far this season. One in the league game of which they lost 4 - 0 and the Spanish Supercopa finals which they lost 5 - 2. Real Madrid Vs Barcelona is yet to meet on the return leg for the League match. But nevertheless, you're absolutely right on Real Madrid losing in all the games they have met in so far this season.
Ahh yeah I was wrong in looking at the head to head schedule and instead included 1 friendly match in it which made it 3 meetings. However, as you said, in fact only two official matches and 1 friendly match this season have the two of them met. But in all these matches Barcelona continued to win both in two official matches and 1 friendly match. This proves that Barcelona's solidity and consistency is slightly better than Real Madrid this season.
And now it is scheduled that these two teams will meet again in two matches, namely 1 match in the Copa Del Rey Final and 1 match in La Liga. And it's possible that the two of them will also meet at UCL if they both manage to continue to progress far together.