The word interesé is the preterite form of interesar in the first person singular.
See the full interesar conjugation

interesar

Me interesé en ella porque era la novia de Takuto.
I became interested in her because she was Takuto's girlfriend.
Me interesé en las ideas griegas de material y forma.
I became interested in the Greek ideas of material and form.
Mira, después de leer tu petición, me interesé por ti.
Look, after I read your petition, I got interested in you.
Me ofrecí a ti, y no te interesé.
I offered myself to you, and you weren't interested.
Me interesé en uno de los personajes.
I got interested in one of the characters.
Me interesé un poco en otras cosas.
I got a little too interested in other things.
Durante mucho tiempo me interesé por el catarismo.
For a long time I was interested in Catharism.
Lo siento, nunca me interesé en la política.
I'm sorry, I was never interested in politics.
Una vez se interesé en mi un caballero parecido a él.
A gentleman rather like him once showed me great interest.
En fin, yo nunca le interesé hasta que me volví adulto.
Anyway, she wasn't interested until I was an adult.
Terminó en mi escritorio y me interesé personalmente.
It ended up on my desk and I took a personal interest.
Tal vez por eso me interesé en él.
That's probably why was I interested in him.
No puedo creer que me interesé en ti.
I can't believe you think I'd ever be interested in you.
Me interesé más por este tema.
I just became more interested in this subject.
Me interesé en la forma que las tijeras los objetos cobran vida.
I got interested in the way that the scissors made the objects come alive.
Porque siempre me interesé en usted desde que le conocí.
Because I've always had an interest in you since I first met you.
Era muy bonita, me interesé por ella.
She was very pretty, and I got interested.
Cuando leí que era de Nueva York, como yo, me interesé.
When I read that he was from New York, like me, I took an interest.
Yo me interesé por el deporte y practico entre otros fútbol, tenis, natación.
I was interested in the sport and practice under other soccer, tennis, swims.
La etapa de mi vida cuando me interesé en Glee fue difícil.
At the time in my life when I got into Glee, it was just hard.
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