Should I wish my ex Happy Birthday?

We broke up a little 4 months ago after being together for almost 5 years and I haven't spoken to him in almost 3 months. We didn't end on bad terms...it's just that things didn't work out for us as a couple...no cheating, violence or anything like that. The last time we spoke, he was expecting me to call him to come over, but I never did because I wanted to get over him and I didn't want to hear him tell me how well he's doing without me in his life. Since I never called, he never called to wonder why I didn't so I just let it go.

Anyway, his birthday is coming up and I want to send just a simple email that said "Happy Birthday, I hope you're spending time with the people you love". No text or calls because I deleted his number and don't have it memorized. I want to because he has always said that birthdays don't mean anything to him, but I don't want to break my #1 rule, which is no contact until I'm over him.

What should I do? Could use advice from both genders.
Should I wish my ex Happy Birthday?
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