I know it's not easy, but certainly also not impossible. But just let the past be the past and move on from here on.

Value one another from here on into the future.
I am a strong believer in second chances, everyone deserves one.

So, just call a clean start and don't poke one another. I guess, that goes in both directions.

In Germany we say "the wiser head gives in".

Let's see if the both of you can be grown ups and wise enough to give in from this point and just let it go.

I value the both of you and think that both of you are great assets to this board in your own way. All people are different and sometimes you just need to agree to disagree. And that's fine.