I don't think him and Big Boi have that type of relationship anymore. Like they're "cool" and aren't gonna be putting their issues out in public but as far as I know they don't really work together or hang like that. Like that Outkast tour a few years ago was just a cash grab and I think Andre is on record saying he didn't really wanna do it. Happens to a lot of rap groups when the members have different personalities/goals.
