
I started looking ahead with the Indo translation just looking at the panels not trying to translate it yet (will attempt to use Google later as Indo translation seems to come out rather well for dramas), and it seems he is haunted by losing her hence needing sleeping pills and having dreams about her and the flashbacks. He didn't know how to express his love properly until after the fact, and he's bitter because he's miserable without her. It definitely looks to be improving in later chapters. i just think it may start out slowly.
My guess there is more to the story as to why he left him. She doesn't seem like a flaky person to me.

He was jealous already with the friend and now the secretary, so I guess it's her turn to feel it. Please let this push her to marriage or at the very least declaring their relationship. He is so perfect. I get she's insecure because of how they started and his status and all, but you need to be honest.
I really enjoy the couple's chemistry and have ever since I read the raws a little with Google translation, so thank you for those who did translate this. This was a love that was present for many years and through hardships. If you really want to read the comic, just read it for them and skip the extraneous crap as much as possible. You could tell how much they loved each other. He treasured her.
At first I felt bad for Ethan, but he became such a scumbag, and don't get me started on her damn BFF who was so insecure she let that bitch know AFTER she already had Ethan thanks to Nari they were together. She is scum. Mina is a nightmare and from a disgusting family kidnapping poor Mason all because he loved someone else who he loved all this time anyways.
Listen, I hate cheating myself, but these two were torn apart. it wasn't as if he didn't try to get over her by leaving and being a man about it. They just were meant to be together. She went to him when he was in the military too. They did try to move on with others. Sometimes life does get messy when you aren't wanting it that way, and sometimes you have to say goodbye to that mess even if it tears you apart, so I don't begrudge them that they found a way through it.
I am just happy they got to be together in the end.
I agree !