To understand Paul better in this passage, it would help to take a larger portion of the chapter:
2 Cor. 1:12-20
For our boast is this, the testimony of our conscience that we have conducted ourselves in the world, and especially toward you, with the simplicity and sincerity of God, (and) not by human wisdom but by the grace of God.
For we write you nothing but what you can read and understand, and I hope that you will understand completely,
as you have come to understand us partially, that we are your boast as you also are ours, on the day of (our) Lord Jesus.
With this confidence I formerly intended to come to you so that you might receive a double favor,
namely, to go by way of you to Macedonia, and then to come to you again on my return from Macedonia, and have you send me on my way to Judea.
So when I intended this, did I act lightly? Or do I make my plans according to human considerations, so that with me it is “yes, yes” and “no, no”?
As God is faithful, our word to you is not “yes” and “no.”
For the Son of God, Jesus Christ, who was proclaimed to you by us, Silvanus and Timothy and me, was not “yes” and “no,” but “yes” has been in him.
For however many are the promises of God, their Yes is in him; therefore, the Amen from us also goes through him to God for glory.
As you can see from the first verses (which were not part of the reading) that Paul had made a promise and then had to break it. It made him look bad and he was reassuring the Corinthians that he wasn’t “two faced” saying “Yes, I will. (yes, yes)” in one breath and then “No, I won’t. (no, no) " in the next. He says in verse 18, " Our word to you is not yes and no.” Then he says in verse 19, “For the Son of God . . . was not yes and no, but always] yes.”
I’m going to find an easier translation (probably a paraphrase) for you that will make Paul’s meaning more obvious.