Trade that happened has the league about to dissolve

I, commish, proposed a trade to another league mate. His Lamar for my Love and Mason. I sent it, he accepted within the hour. No conversation, just a blind offer and acceptance.

Trade goes through and I have one manager blow up the league chat saying how unfair the trade is, and that it should be reversed because I’m taking advantage of the other manager.

This is a keeper league where you get to keep the players for round value -2, drafted in 7th keep in 5th.

The other manager in the trade posts to the chat that he’s looking for keepers for next year because he’s like 1-15 with game against median scoring.

The manager who was throwing a fit has a trade of similar players as mine go through with his cousin. They ended up reversing it after I started asking about collusion, while denying collusion.

The manager throwing the big fit insults the league essentially and says he’s done after this year. One other player chimed in, also the manager throwing a fit’s cousin.

Just posting for thoughts and how to handle the situation. This is a league of friends mostly that has been around for about 15 years off and on.

Thanks in advance.