There was something more painful than knowing that Dylan didn't love you or that he was at least only giving you half-hearted love since he still loved someone else. His ex-partner. With him you learned that you can give everything to someone, but it will never be enough if you are not the one who wants to give it to them. And although you wanted to leave so badly, it seemed impossible to do so.
"You shouldn't have waited up for me. It's too late. I told you I'd stay at the company a little longer."
He was lying. You knew right away that he was lying. When he didn't look you in the eyes to talk it was because he was hiding something. And you knew what he was. Dylan had attended his ex-girlfriend's birthday party today, you had seen the photos on Instagram. There were two things you didn't understand, why he hid it and why I kept lying to you when he said he loved you when in reality he was just using you.