Because a boy's hairline is high, it means that there is no hair on the top of his head, that is, next to his forehead, which makes people feel bald. Therefore, with short hair, the whole hair is very short, and it will not be obvious without the hair on the forehead in front, which will make people feel more natural.
Moreover, short hair can also make a boy look leaner and more energetic. Anyway, I don't like that kind of long hair, or a perm or something. It feels ugly. I always feel that too much hair on my head will make people feel depressed. Moreover, short hair is particularly easy to organize and does not need to be done. Just touch it with your hands, which is convenient and beautiful. The most suitable thing is that the hairline is high.
The main thing is that it's not pretty, so I've been keeping my hair short ever since, which is thinner and more convenient. However, if you just want to keep your hair long and make yourself cool, cut it back. This hairstyle is cool and suitable for boys with high hairline, but it has one more requirement. Boys with long faces will look better if they cut it.
I hope what I said is useful to you.