Most Helpful Guy
How would you send her the text if she blocked you everywhere? Give her a card personally? I mean... some will say don't do it cause it shows you are weak and still thinking of her. ( By the way, how long ago did she become an ex? and what happened, who decided to split and did it turn nasty? )
Some will say do it.
Ultimately you should start thinking about you: what YOU think this happy birthday will get you, how will this affect YOU, how will YOU feel afterwards.
As a guy in your position, just that it was EXACTLY a year ago... I did it. i wrote her a message. Don't know what i was thinking or expecting to get, i just did it. I didn't expect anything because her behaviour that far showed me how things will go and i had no expectations at all. My story is a hell more complicated than yours. I BET THAT.
I did it. And it felt good. I proved myself that i'm special. i proved that i'm not that kind of guy to talk trash about the girl just because she acted like an idiot. It was my way of saying goodbye FOR GOOD !
She never tried to contact at all. You should expect that. Don't get your hopes high that she'll realize what she lost. Don't expect her to turn the favour back and write you on your birthday, she won't ! If you want to ask some other questions regarding this issue, go ahead.