Getting married in Dublin

Hello there!
I really need some advice. I am from equator and married an EU citizen almost 2 years ago but I'm filing for divorce now. I live in UK but going back home Equator late July and wont come back.
I have been told that my decree absolute will be in late august.
I got an irish tourist visa now and planning to go to Ireland and stay at least 3 months and live/marry my new British partner.
He has been living and working in Ireland for a year now.
I called the Garda Immigration Bureau just to ask them if with my Tourist visa I am able to get the 3 months stamp as to get married in Ireland you need to give 3 months notice in the register office.
He asked me if I mentioned that i was going to get married while i applied for my tourist visa. I said no... so he said well you will be in trouble and you wont get into Ireland because you didn't tell that to the embassy while you applied for the visa.
Is this true? Should I have told the embassy?
I want to live with my new partner to see if we get on and then get married but lets be realistic what about if we don't get on? What is the purpose of telling the airport immigration that i will get married when maybe i will not!
This is my 3 Irish tourist visa and I got them because i have been living as a family member well obviously i split but still working until the school academic year finish as i work in a school(late july) I am still staying in UK BECAUSE i need to be sure that the divorce is working properly as my ex has signed the documents but wont pay any court fees. I don't mind that i already paid them.My ex hasn't told the UK border about our split as our divorce is amicable and he doesn't want to affect my finances and my job situation. He will do when we both get the decree absolute as he wants to marry his new partner too.
Help!
When i get to Dublin Airport should i tell him about my marriage? or not?
or should i go to the Garda and tell them that and registered with them etc?
Thanks!!
Lucia

Lets get real.

You are not going to Ireland to get married.

You are going for tourist purposes, but in the back of your mind you are also thinking about meeting/dating this new person, and then may be you will decide to marry, or may be you won't.

So, keep it at that. You are going to Ireland as a tourist.

If there is a change in your personal life, and you decide to marry this person, then see where and when you can get married, and further course of action. There is no need or requirement to tell any authorities in any country when you only merely intent to kind of "date" a person so to speak.

Thanks Preston. I realised I have a Family/visit visa and not a tourist visa. So the embassy knows i am staying with a friend and knows his address too. I didn't mention the embassy he is my new partner as i am still married. My future marriage has no date yet as I don't have an exact date of my divorce.
So I am flying in late August and hopefully get 3 month entrance so i have enough time to make the 90 days notice to the register office...but if i don't get the 3 months and if i get less e.g one or two months...am i able to extend my visa for marriage purposes?
Thanks for you help

Luci