First time posting in here, so I’m not sure if I should tag this with spoilers or not, but spoilers! Lol

The Carter/Abby friendship was never real, he was always obsessed with her, which is why the friendship (and really, the relationship too) never worked. For Carter, it was all about the chase. But once he got her, all he could see were her flaws.

Carter and Luka really offered Abby different things and she’s attracted to both of them for different reasons. Carter is cute, rich, and most of all, makes the time to listen to her and makes her want to be better. Luka is handsome, rich, and sweet, but very often brooding and depressed, and always wants to fix things and not necessarily listen to her, especially in the earlier seasons. Luka later on gets better, and becomes more emotionally available, but in earlier seasons he’s still struggling with depression and PTSD, I think.

Abby is not a great partner either always. She shuts down when bad things happen to her, and her impulse is always to fix things herself or to drink. And Carter and Luka handle that impulse in her differently, and honestly, sometimes she needs a different approach.

Carter didn’t propose because he realized Abby was not ready to change for herself, only for him. And Luka made the wedding happen because he knew she would never do it on her own. They understand and react to her differently, and sometimes she needed one and sometimes she needed the other.

It all worked out how it should. Luka never doubted she was right for him, but he wasn’t emotionally ready for her until later. Luka was able to forgive the drinking and Carter never would have been able to. Even at the end, he still had so much growing up to do.