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Before everyone jumps on Jitae, he is definitely lying, to save Mieum. He knows that Hajoon hates Mieum and that Jian just wants to use Mieum, so he needs to show that he doesn't care about him.
Also if you remember Mieum has never asked Jitae for money, he tried to work quietly, and after getting exposed as a spy, it was Jitae who offered him to help find his dad. But here Jitae says that Mieum wants money (while what Mieum wants is to find his father,and it was Jitae who first offered to help him).
And in the end he says "that's why I'm going to stop". My theory is that he is saying that he is going to stop coming to the bar (for prostitutes) , because he wants to "play" with Mieum (while we know that he loves Mieum and wants to stay with him and do it with him only, but if he doesn't go to the bar, they will suspect something)