Can anyone translate these phrases into Italian?

Im writing a story where the main characters are Italian and need help translating a few phrases. I tried using translation services online but I got

I'm writing a story where the main characters are Italian and need help translating a few phrases. I tried using translation services online but I got different answers.

'our eternal secret' (like something was a secret forever between two people) I got segreto eterno/eterna & segreti eterni for this one. Are any of these right?

'you're welcome' (to a male)

'I love you' (to a female)

'thank you very much' (to a male) I was going to use 'Grazie di cuore' if that's correct.

Thank you for your answers!

or:I'm writing a story where the main characters are Italian and need help translating a few phrases. I tried using translation services online but I got different answers.'our eternal secret' (like something was a secret forever between two people) I got segreto eterno/eterna & segreti eterni for this one. Are any of these right?'you're welcome' (to a male)'I love you' (to a female)'thank you very much' (to a male) I was going to use 'Grazie di cuore' if that's correct.Thank you for your answers!

or:\"You're welcome \" is Prego (No gender distinction)I love you is \"Te voglio bene\" (if it's friendship) and \"Te amo\" (for romantic love)

or:Our Eternal Secret: il Nostro Segreto EternoYou're Welcome: PregoI Love You: Ti Amo (romantic) or Te voglio bene (family or friend)Thank you Very Much: Grazie Mille. Grazie di cuore means thank you from the heart.Buona Fortuna con la gioca!

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