Thank you so much for translating this.
We need a full version, where he doesn't know what do. But then he accepts that he can't betray her as a friend. And just as he's about to come forward, his locked up feelings break. He can no longer keep accepting himself as a loner... not needing a girlfriend. He realizes that it doesn't have to be this way. Then he has to struggle with the morality of taking advantage of the situation. Which eventually leads him to building a true proper connection with her. And for the first time he starts to truely wonder if he likes her. And since this is a romance, the answer is yes. But now he's going to do get her for real this time.