What a boy touching a girl's head represents mainly depends on the relationship between the two parties and the situation at that time, so as to more clearly judge what kind of emotions the other party is expressing.
1. Representing indulgence
If both parties are siblings, touching their heads represents a form of indulgence and comfort. When a younger sister is wronged or in a bad mood, a brother touching her head can provide comfort and make her feel dependent.
2. Representative Appreciation
If both parties are iron brothers, then the boy touching the girl's head may represent appreciation and teasing, because there won't be so many reservations between brothers and they will be more casual.
3. Representing unrequited love
If both parties are ordinary friends, then the boy touching the girl's head represents a secret love. When boys have vague emotions towards girls, they will express their unrequited love by touching their heads.
4. Representing love
If both parties are a couple, it is common for a boy to touch a girl's head as an intimate act. This is a direct expression of his love and can make the girl feel pampered and happy.
5. Representatives want to further develop their relationship
If both parties have a good impression of each other but haven't spoken up, then the boy touching the girl's head is testing whether the relationship can be further developed.