In his book Hagar speaks of the Van Halen brothers being very jealous of his outside business interests to the point where they would instruct managers to prevent or intercept any questions to Hagar. He says the brothers fought each other a lot too and would, when they didn't want anyone to know what they were fighting about, just curse each other out in Dutch.

In Hagar's account Eddie is very controlling and way too sensitive and something of a passive-aggressive personality.

"When the snows fall and the white winds blow, the lone wolf dies but the pack survives."
Winter is Coming

Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die.
As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.