Could be that the characters aren't relatable or the themes don't appeal to your interests. Sometimes it's just a matter of personal preference and not a reflection on the quality of the manga itself.
Well, it could be that the characters or the plot don't click with your preferences. Sometimes the art style or the way the story progresses just doesn't feel right for certain people.
We can conclude that Wang Xin doesn't like Ma Yan. Although Ma Yan was interested in Wang Xin, Wang Xin had no feelings for her. On the contrary, Wang Xin and Yao Yuling's relationship was even closer. They often hung out together, and Yao Yuling expressed a strong interest in Wang Xin. Therefore, it could be said that Wang Xin did not like Ma Yan.
You can't be sure if he likes you or not because it's just his way of expressing himself. In a relationship, everyone had their own way of expressing their love and affection. Maybe your boyfriend has a special way of expressing his feelings, but that doesn't mean he doesn't like or care about you.
If you're still confused about him, you can consider communicating with him and asking him about his true thoughts and feelings. Maybe you can understand each other better and find a more suitable way to get along.