Toxic friendships can be difficult to identify or resist when a third party confronts you about it, especially when you’ve known someone for so long. Of course, your first instinct would be to defend your friend (whom he calls toxic) in the name of your friendship for how many years. You wouldn’t immediately believe it when somebody says your friend is toxic to you. You need to give your friend the benefit of the doubt.
You would need to consider his upbringing, family issues, past life choices, and every little factor that can justify why he’s the way he is. You need to be a friend. After all, this third party wouldn’t possibly know everything that happens in your friendship, right? He doesn’t even probably know how you two became friends, where your favorite hangout spots are, what the first three secrets you told each other, etc. Long story short, he wouldn’t know the nitty-gritty of your friendship.