Old love interest, now married texts you happy birthday after 0 communication for 3yrs. How does one resopnd?

She got married the day after my birthday which is also my dad's birthday. We'd talked about it previously. Don't know how it wasn't intentional. Anyway amongst other signs and reasons I ghosted and we never spoke since. Just odd, never thought it'd happen.

Old love interest, now married texts you happy birthday after 0 communication for 3yrs. How does one resopnd?
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