...She doesn't believe him. He's not that great a liar. King isn't acting, more like performance, he doesn't really have much experience playing things off. So...time to opt for honesty?

"It's not that... I'm not sure if I could talk about it? I didn't get much sleep last night."

Well, he already knows he probably can't talk about it, not to anyone but Rommy (who the hell else would even believe it?), and given the app woke everyone up at late o'clock...