Texting an ex happy birthday?

It was my "sort of" ex's birthday yesterday. I truly miss him- we used to be good friends and then just discussing being in a relationship together ruined things and now we haven't spoken in a little over 2 months and stopped following eachother on social media. It ended very badly.
But I'm sort of over it and just want to be in touch to say happy birthday over text. Any thoughts/ opinions?
Texting an ex happy birthday?
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