It is indeed easy for girls to cause misunderstandings when giving gifts to boys, but based on your relationship, it is still necessary to give him a birthday gift. Single people, especially those who are more introverted, most hope to get more care from their friends, not to mention it is their birthday, a small gift can make him feel the warmth of friendship. You can give him a box of DIY blessing chocolates, and wish him to find happiness as soon as possible, and tell him that when there is no love, the warmth of friendship is as delicate and rich as chocolate.
You can also give him a cartoon painted sunshine jar, which means that his future life will be full of sunshine, which is a good choice.
Or you can also give him a bouquet of flowers. You can choose yellow roses, which represent pure friendship and good wishes. The flower language of yellow roses is still luck, which is a good gift for ordinary friends.