How do I get better at hiding emotional responses to shit tests? Just have more control over my responses in general?

For instance, this girl who I'm trying to fuck. For non judgemental sex story I brought up how someone is trying to hook up with me. Guys also have girls trying to hook up with them. As I expected she got jealous. Right away and her response was to tell me how a guy turned her on this weekend. Then she kept pushing with this one story and I never reacted to it and never said WHO?!?! I just said that's interesting. Then I spoke about sex generally, she went back to telling me how she doesn't has sex but did stuff with this guy this weekend.

I was taken aback, because she is supposedly dating someone who is NOT the guy she keeps talking about but only brings up this guy when I talk about sex or mention sex in anyway.

Truth be told it is difficult to hear but that's what a shit test is right? Like to get a response? Next second she is lecturing me how Catholics should lead their lives free of regret of Sex. How do I handle these tests and show my SMV? I want to get across to her, you can fuck or date whoever you want I don't care and I am going to be the best fuck of your life.

But the shit tests pile on and if I ask who or what did you do or how dos THAT happen? Then I fucked up. So how do I stay calm and survive the shit tests!?!