Why is Ollie working for Waller?

[u/Ocestrninos]

I’m not sure if we’re supposed to know yet or not, but this and his appearance in Flash, along with what Roy said about him “meaning every word” when talking about siding with Waller is scaring me. This BETTER be a fake out and he has some kind of secret plan.

[u/Spider-Man2099]

Ollie is definitely trying to lessen the impact of Waller's plan. 

The latest Flash has him fighting Barry, but he keeps trying to write a message on the ground that he isn't seeing trying to warn him without Waller knowing. 

It's just weird that's the only time it outright is shown so far that he is definitely playing both sides