Boys are not always good at expressing their emotions. Maybe we understand, but we rarely hear it. You will never understand exactly how he feels or thinks, so it is good to notice some of the behaviors below:
He sends you idiotic messages
The more banal the messages, the more intoxicated by love he is. If he writes to you while drinking something, or if he has seen a cat like yours, he has been struck by Cupid's arrow.
He always calls you
There are three reasons why men pick up the phone: (a) for work, (b) for emergencies, or (c) to hear someone's voice. Unless you are a colleague or a 127 operator, it is your voice that interests you.
He no longer wants to write with others
It is the girls who usually write to the boys so if they do not write to them anymore, neither will they. But if he writes to another girl and meanwhile he is already interested in someone else, he tells her he is not interested.
He seeks advice from you
"What should I write on my brother's birthday card?" or "Do these shoes look good with these pants?" are some of the questions that indicate he is full of hormones.
Listen to his friends
No one knows that guy better than his friends. Listen to them if they tell you about changes they have noticed in their friend.
Source: Women's Health