You really did not pay attention. Before the flashbacks, suano stopped lemon cause he said he already knew it was a lie and did not want lemon to feel awkard and discomforted diving into the past. After the flashbacks lemon goes back to explain everything suano and apologize again and suano realized lemon did not felt awkard or distant about it and wanted to get it out of her chest at chapter 67 and suano tells lemon that she should not apologize but he should just listen to what happened back then and get things cleared up for the better. At chapter 68 we see they have talked it out already and suano even addresses he should have tried yo be there for lemon earlier. So she already apologized. Suano did not want an apology, he just wanted to accept the past and move on together. I also think he needed an apology and hey she wanted to as well but suano made sure she was comfortable so instead of an apologetic explanation, he prefered to talk it out without any blames. Lemon even did say it was the best thing happened to her and it would have been better for both of them if they worked it out together way before.Don't know about you, but he deserves some form of apology at the very least since it was very real to him for a long time and now just trying to make a pass at him again after that, like nothing happened, aint right in my opinion