On a scale of 1-10 How Stupid was I for messaging my ex Happy Birthday?

I'm not surprised it was just left on read as we haven't really spoken since a couple of weeks after the split which was about 10 months ago. Before any of you say oh just get over it, we were friends or had known of each other for about 7 years before we got together and that friendship state is all I'd ever want back if anything (I wasn't even sure about sending that message). We aren't friends, we aren't enemies, we see each others social media updates regularly with no hidden feelings (Well only able to speak on my part). Things had improved between us over the first few months of the split but was still odd if we saw each other in person with mutual friends, don't know if that's improved since.
On a scale of 1-10 How Stupid was I for messaging my ex Happy Birthday?
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