But their relationship now is healthy though. They've both grown and matured to responsible adults now capable of making confident decisions regardless of their past. For that reason, they're fully prepared for the consequences of their current choice.
I understand what you mean, but why did it take losing the MC for the ML to regret his actions or simply to value their relationship? I know this is fiction and whatnot, but in real life getting back together with a person that hurt you emotionally isn’t exactly healthy. I also believe that putting an end to a relationship means that the people involved are just not meant to be.
I think what the author demonstrated in this story is that the past destructive behaviour of the characters were down to immaturity which is why they gave them some time away to mature and reflect. After this, each became a better person which also happens in real life. I therefore think it's the intention of the author for the readers to move forward with the characters on that basis. However, everyone is entitled to how they interprete the story and what they feel.
At this point I’m not even surprised, I’m just disappointed. Saw it coming from miles away but still hoped that the author might grant a healthy relationship for the MC, I was too optimistic…