Although the story was interesting, I didn't like the ending at all. The guy was a player to the end, breaking people's hearts. He didn't change at all. At least that's how the story showed him. He broke A's heart and did it right when she was having exams. I think he was a creep, even if after that he did change for the better and stopped having unislamic relationships. It's true that the story might be based on a true story and so you have to write it as it happened, but if you want to benefit people, you might want to make a few changes. Like have him visit the forum and become more practicing after he's broken up with A, so that the break up with A is during the time he was bad. Or if he really loves A, he can simply tell her that it's better to put off their relationship until they are older and can get married because it's unislamic to chat, that he still loves her and wants a future with her but can no longer chat with her, etc.
What S did was not at all commendable. Look at all the harm she caused, making the main character go astray too. And the main character continued to do the same thing to the end. Imagine what his behavior would have caused A to do? Did she also become a player like he was?
It's important for Muslims not to start something they can't complete. It's wrong for someone to start chatting with someone when they know that they can't marry the person, and then after chatting for a while, break it off saying that it was the wrong thing to do. This is because during those few chat sessions a person's heart may have gotten attached and will be hurt by it. I think many people do this for short-term enjoyment but it's a terrible thing to do and very unislamic too. It's wrong for a guy and girl to chat and be friends but it's even worse when they have no intention to marry but deceive the other into thinking that they do.
A verse that comes to mind here is:
﴿يأَيُّهَا الَّذِينَ ءَامَنُواْ لِمَ تَقُولُونَ مَا لاَ تَفْعَلُونَ ﴾
(O you who believe! Why do you say that which you do not do) (61:2)
