Charles and Liza-Spoiler Question

So hopefully you see this is a spoiler.

Okay. At the end when Charles leaves Quinn and decides to get back with Liza, why is he so concerned about “lying” about Inkubator. She didn’t know that Kelsey submitted it to have VCs look at it until after it made its rounds. Now I think Kelsey should have told Liza and Charles that she was weighing her options but didn’t Charles start a whole competing company with Zane of all people and not tell Liza until they bumped into each other at lunch? This whole set up was poorly written in my humble opinion.