Judging from the ingredients of milk tea, it contains sugar; The mixture in milk tea represents a sweet and intimate relationship; On the way to love each other, many people will express their different relationships with the opposite sex by sending milk tea.
So boys send you milk tea, which shows that you exist in boys' hearts; He just wants to let you know with this behavior that his heart loves you; He just wants to tell others that his relationship with you is very close;
Think about it, in a boy's heart, if you don't exist, let alone send milk tea and buy a glass of water, he won't do it; So it is a kind of love for boys to buy milk tea for girls.
As a girl, whether you love boys or not, and whether you have a good impression is the most critical factor for whether you are willing to accept boys' milk tea; If you have a crush on a boy, he will buy you milk tea, and you will accept it happily. Of course, you can also buy milk tea and send it back to him.
But if you don't like him, or have no idea in your heart, you'd better refuse him; He will naturally understand that if you refuse the milk tea he bought, he will no longer have illusions about you.