Hmm, while it’s possible that April puts all those points together and is surprisingly understanding, aside from the fact that it’s a TV show that seeks heightened drama, there’s a difference, I think, between an impersonal response that only looks at the logic and facts versus one that reacts to the emotion of the situation. Given who this involves, it would be extremely natural for April’s initial reaction be to the betrayal of it all.
And that’s what it would be, it’s not just that it’s her dad, or that Sterling technically never lied, or even what their relationship was like when it all went down. She’d be mad that it was Sterling who did get extremely close to her, who she told all her secrets to, who kept this from her. It would hurt on THAT level. It doesn’t matter that she was mean to Sterling and Sterling didn’t use it against her, that doesn’t get her bonus points when it was Sterling who chased a friendship and then kissed her. She totally bared her soul to Sterling about it all! Who throughOUT the show, has expressed concern and sympathy because of her father’s situation, all the while she was the one who secretly caused it, like, this isn’t about the father, this is about April and Sterling.
And in fact, if the show somehow does subvert some of the dramatic expectations and has Sterling tell April about it, that would very much change the equation, and April’s anger might be a one or two ep arc instead of half or full season.