One piece of advice for the future:
if you have alliance buddies that you like, then by all means establish contact with them in Line or another chat app of your choice. Then you cannot lose them like this.
I speak from experience.
It took me and another alliance buddy several months - and immense luck - to re-establish contact with a former alliance buddy from another alliance who did not have Line.
With a huge piece of luck, my buddy found the guy. And he is now in our alliance.
I hope you will find your alliance buddies again.
And, let me tell you, that temper tantrum guy’s reputation in the game will be shot. No matter what his team power is. We have had two such cases in Germany (two that I know of) - and both those people have since disappeared from the presence of self-respecting players. Goodbye and good riddance