Dag Ilse,
I'm sorry to hear that you haven't been able to see your partner in months given the current situation.
What I can suggest you is to keep an eye on the official travel guidelines such as the
Health Service Executive website for the Republic of Ireland.
You’ll find guidelines on arriving to Ireland from another country and self isolation. Another tip I can give you would be to contact the airline you intend to use for further information.
Stay safe!
Met vriendelijke groeten,
Antoine