Stokes and McCullum have faced questions about the state of their working relationship since the Ashes, questions that intensified in the aftermath of the player's nightclub incident.
Speaking two days before the second Test at The Oval, when Stokes was unavailable, McCullum repeatedly mentioned his "worry" and "concern" for the captain.
On Tuesday in Nottingham, McCullum revealed he and Stokes had spoken for more than an hour and that neither knew where reports of a rift had come from.
And on Wednesday, Stokes said: "Me and Baz are mates. When you're worried about a friend and you're not quite sure what's going on, you're going to want to look out for them, you're going to be worried about them, are you not?
"Last week, in terms of the words that Baz used in the press conference, don't look into them too much. He cares about me, I care about him and Baz cares deeply about everyone who walks into this team."
However, when asked about the support he received from the ECB, he added: "It was a process that needed to be played out. The process has been played out. Me and Gus are back."
On the process itself, which took two weeks to conclude, Stokes said: "I'm not going to sit here and lie. Was I a bit frustrated by the process? Yes. Has the process finished? Yes. Are me and Gus back, where we want to be? Yes."
He also described the "love" he has felt from England supporters during his time away from the team.
"Over the last two weeks, it's made me understand yet again how much support not only this team gets from the fans, but I also felt a lot of love of and a lot of support," said Stokes.
"There are a lot of people who love this English cricket team and love me. It sounds weird saying that, but you know what I'm trying to say.
"I'm incredibly grateful for the support I've been shown over the past two weeks and it's something that has not been missed in this whole two weeks of chaos. It's been nice."