Dear Wiktoria,
I want to take this moment to apologize from the bottom of my heart. I made a mistake and I deeply regret it. I understand that I have hurt you, and I am truly sorry.
My actions were inexcusable and I take full responsibility for them. I want to make things right and earn back your trust. Please give me a chance to prove that I can be better.
I really love you and I never wanted to play with your feelings. You mean everything to me, and I am willing to do whatever it takes to make things right.
With all my love,
Mehyar