My ex-girlfriend broke up with me for a year! I sent her a message wishing her a happy birthday, but she didn't reply to my message! What does this mean?

If your ex-girlfriend broke up with you for more than a year and hasn't contacted you, then you sent him a happy birthday message on his birthday and your girlfriend didn't reply to you. It means that your ex-girlfriend doesn't want to contact you at all. She doesn't want to have anything to do with you. In this case, your ex-girlfriend will not want to get back together with you. After the qualitative change, if you send him a message on any holiday, he probably won't reply to you, because she doesn't want any more involvement between you.