You don't have any option but to leave. A condition you agreed to when you sumitted your application. Overstay will make it more difficult you delibrately didn't abid by your conditions so why would you in future?
If you plan is to live in Ireland with your partner, why didn't you go spouse/unmarried partner visa route?
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You don't want to go illegal then this is the only way
They will ask how you entered the country with no visa? Port of entry ?. If you have a passport stamps. Probably just to clear up your immigration status
You say PAYE that’s presuming tax is deducted at source and wouldn’t one want to know how much tax is being deducted?. It is illegal to NOT provide a payslip.
You must leave at the end of your visa(one of the conditions you agreed to) and your employer will get you a work permit if you fill various criteria, salary etc
If you want to get your girlfriend here then you must make sure she is going to return to Philippines. You Want to get married so apply for D visa forget shortcuts