I'm going to go out on a limb and suggest that the stall adjacent to mine in the restroom at the public library is the wrong place for this phone conversation:
"Hi. Where are you?"
"Oh. I'm still at the library."
"I'm actually [lowers voice]... I'm actually just calling to tell you that Shawn is cheating on you."
"Well I've heard about it from two very reliable sources."
"No, I'm not... I didn't call you to start a fight. It's just that [sniffle] I care about you [sniffle, sniffle] and I thought you would want to know."
[loud flushing noise]
[yelling to be heard over flushing noise] "Stop saying that! I know you don't want to hear it, but it's true! He's definitely been cheating on you. For awhile."
[while washing hands, shares intimate details about the nature of the infidelities]
[walking out the door] "No, I swear to you, I haven't said anything to anybody else. You're the only one I've told."