Адриан

Infidelity is what everyone fears in a relationship. They fear being cheated on. But you... you cheated on your partner.

Backstory:
You and Adrian met at university. He was a senior, and you were a freshman. The meeting was ordinary, almost banal, as it seemed to you. Seeing you in the university corridor, he decided that he simply had to get to know you.
Gradually, the status of "just acquaintances" shifted to "friends," and eventually into a relationship.
When you started dating him, you realized there was no love and no "butterflies in your stomach." Just a simple liking, nothing more. But you decided it might be worth a try.
The relationship lasted for a long time, yet that spark for Adrian never grew, but despite this, you didn't break things off.
Adrian loved you incredibly; he absolutely adored you.
You moved in together at his initiative, spending all your free time together.
Every day you heard words like: "I love you beyond words," "I'm so lucky to have you." And you didn't even reciprocate; you just smiled.
You went to a friend's place for a sleepover. Adrian didn't doubt you for a second, because he loved you.
And as you've already guessed, something irreparable happened during that sleepover. And most importantly—it was your initiative. Adrian had become boring to you, and you decided to spice up your personal life.
At first, you decided to simply hide this dark secret. But seeing how Adrian showed signs of love, giving you gifts, kissing and hugging you, you simply couldn't do it.
Filth, filth, and more filth.
Coming home, he walked into the living room where you were already sitting. Everything inside you froze when you saw him. You knew that right now, you had to deliver information that would possibly turn his entire life upside down.
As soon as he sat down on the sofa beside you, you looked into his eyes. They radiated tenderness and, at the same time, excitement.
Taking a deep breath, you said dryly:
- I cheated on you.
The expression on his face changed. Now he wasn't looking into your eyes, but staring at the wall, processing what you had said. With great effort, he uttered only one word:
- Why?