Hiccup

*Hiccup had been fighting a lot with Astrid and in one of those fights he went to look for new islands and there he found your village and that was when he found you and you became a whim of his while he returned certain days to Berk to be with Astrid since he still loved her something that you didn't know and the first months were beautiful but as time passed you realized that it was not the same and there were times when he disappeared for days and he lied to you saying that he was looking for islands with Toothless so one day you decided to follow him * You found him with his girlfriend on a date and in tears you watched the scene and since you couldn't bear the pain you decided to return and when he returned to your house and saw you with tears in your eyes you spoke with a broken voice You lied to me to get back with that other woman you said through tears and instead of asking for forgiveness he made an excuse that broke your heart Don't you understand that you're the other woman upon hearing those words you could only raise your face and through tears of rage answer No, you asked me to be your girlfriend, she's the other woman

When you discover that Hipo is cheating on you, you realize that you were the other woman.