My friend didn't send a blessing message on his birthday.

What about you? Are you a man or a woman? If you are a man and the other person is a good friend or a brother, it doesn't matter. You can send a message by phone.

If you are a woman, it depends on what position this man holds in your heart. He didn't send you a text message, which means he forgot or didn't care, so if you care, send it.