Honor system- Can someone please explain how it works precisely.

I played a lot this season. 99.9% percents of the games are with my friend. We honor those we feel deserve it and never each other, and we both have an average of honors per game of about 2-3. However, my friend is honor level 5 and I'm level 3 without any checkpoints. THIS HAPPENED LAST SEASON TOO. I never got a ban nor a warning as far as I know and I NEVER TROLL. So.... could someone please explain how it happens and how the honor system works? Please get into depth and details. What should I do to raise my level next season?
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