I have not contacted my ex-girlfriend since I broke up with her last year. Is it necessary to send a message to wish her well on her birthday tomorrow?

You can send it ... I think ... although we are separated ... there is no need to contact ... I think if you send it, I will be happier if I were her, at least you remember ... you can simply send it ... Don't be too nostalgic. You don't know how she is now ... it's not good to be nostalgic. For example, I wish someone a happy birthday. I hope ... (Blessing) to care about her. One last question (How have you been recently? Then your name (just short name, as long as she can understand it)