My ex-boyfriend wishes me a happy birthday.

I can only give you advice and see how you choose.

1, if you don't reply, it means that you completely refuse and don't want to contact him again. Of course, it may also mean that you still can't let go. Even if you want to refuse, this method is not recommended.

2. Reply "Thank you." Not including quotation marks, just three characters. The words are very simple, and the meaning is not simple. It not only gives him a reply, but also reveals his calmness. If you know that you don't care, this is the best way to sever the relationship. Of course, if both parties are in a good mood, there is a certain chance that they can be ordinary friends.

3. Reply "Thank you!" Add something like "How are you recently". It means you still care about him and want to stay with him. If he has this idea, you can continue the topic.

Of course, the application of the third case, I suggest you think twice. Make sure you really want to continue, after all, what you said is too simple, why did you break up, whether it is worth coming back and so on. I can't judge.

Finally, no matter which one you use, I hope you can get the life you want.