I am from a working-class, very devoutly Catholic family in rural Ireland, and I left school in 1990, so was a young adult in the 1990s. Some elements of what your ex says are certainly not widespread for that period in Ireland, a few are characteristic of poor, devout rural households with a low level of parental education.
I know literally no one who stayed living at home until they married, or who became a housewife 'automatically' on her marriage. I have three younger siblings, and we've all spent long periods studying, living and working on other continents, and only one of us now lives in Ireland, nowhere near our parents -- no expectation we would stay close to home.
Four children for my generation would be very unusual (see info below on contraception) -- none of my siblings, married or not, have children, I have one child. I would say there's far more in-family socialising here where I live now in rural England, than in rural Ireland in the 1990s.
Some parents probably imposed curfews on YA children living at home, and were definitely less liberal than now about letting a boyfriend or girlfriend stay over -- in a devout family, the adult child going away with a boyfriend or girlfriend would have just lied and pretended they were going with a friend.
Regular mass attendance while living at home was normal, but quite often people just glanced in the door, so they could simply report that Father X had said mass when asked.
I think I knew of one person who entered the Rose of Tralee first round, because it had always been her granny's dream, but she showed up in a tux and eyeliner rather than a lovely dress, and was eliminated immediately. We always thought it was hilariously awful, and mostly for Irish-Americans who showed up and did Irish dancing and read embarrassing poems to Gay Byrne. 
We all had sex before marriage, but remember that the availability of contraception was only beginning to be liberalised (in 1991 the Virgin Megastore was sued for selling condoms without a pharmacist present), so people were more sexually cautious for good reason, especially in rural Ireland, where buying condoms before they were available in pub vending machines meant walking through a line of your grannies' friends waiting for prescriptions in a small local pharmacy and asking for them across the counter, or waiting to bulk buy in the nearest city.
The abhorrence of alcohol is not terribly uncommon (though still a minority thing) among my parents' generation (born around the end of WWII) there had been such an epidemic of male alcoholism in Ireland, for various complex sociological reasons, in the early 20thc, that there was a thriving Catholic temperance movement (the 'Pioneers'), for entirely sensible reasons. It was normal for my generation to pledge not to drink alcohol when you were being confirmed (though I didn't, and my mother was mortified). Neither of my parents drink, would feel at all comfortable in a pub, and know nothing at all about alcohol every Christmas I have to stop my mother pouring a full lemonade glass of whiskey for a visiting uncle, because she has no idea about measures/potency, and thinks a small glass 'looks mean'. (Also, I think they've had the same bottle of whiskey for about 20 years, purely for visitors.)