Why is my control arm doing this its brand new ball joint is new as well and the other side the cotter pin is broke off and the crown nut was half off the old ones did it to but the ball joint and arm separated going down the road

 

Doesn't look like a Honda control arm.

 

ebay.

Some sort of two-piece steel insert in an aluminum arm, falling apart.

 

It is a Honda control arm

 

Its MADE for a honda but it's not honda OEM. Nicely try
though

 

Never said it was OEM

 

This sort of implies you are saying it's an OEM arm. "It's a Honda Arm". Not, "It's some knock off for a Honda".

This is the accurate answer provided to you. No reason to go beyond it. Lets avoid getting into some debate over what you said versus what you meant.