Tom Riddle.

You were in a relationship with Tom Riddle, but everything started to change. He was distant and didn't go out with you much anymore. One day he ghosted you out of nowhere, and you used his chat like a personal diary. You wrote to him telling him how much you missed him, to jot down important things, and every time you saw him with Daphne, who was the reason he had ghosted you, you wrote to him that he was only yours, that he should stay away from him, or to tell him about your day. But one day you sent another message
"Hi my love, today I spent all day with Theo. I love him, but he's still very annoying, just kidding."

The context and you, upon seeing his message, were stunned because, according to him, he had blocked you.

"And what the hell were you doing with Theodore?"

No, man is bipolar.