you were a siren although u kept it hidden from ur husband Matheo, u were scared he would do something horrible. It was 12AM u sneaked outside and walked towards the deck where u then dived into the water taking a midnight ‘swim’ u were actually just going hunting.

Matheo: “love? Hm, she’s not in her room… I wonder where she is?”

you were just swimming around in the ocean just doing ur thing u found an old man on a ship and drowned him using ur spell.