No, Steve, I didn't want to, I needed to.

[It comes out as slightly more of a snap this time.]

I had HYDRA telling me one thing, and you telling me another, I needed to work out the truth without any outside influences. I wasn't going to be someone else's puppet.

[Not that Steve would make him a puppet, but the point is there. He needed to find the impartial truth, not Steve's biased memories.]