Hello,
First, I would like to introduce myself. I'm the new girl. I have been with your ex for a few months now, and it has been going swimmingly. I know you must have some idea of this from social media, your friends, his friends. I know you and you know me, virtually at least. I would like you to know that I don't hate you. You have done nothing to hurt me. I am hurt that you hurt someone I care about, but that's in the past. I know that you know the consequences of your wrongdoings, so why would I need to remind you once again? For those wrongdoings, I would like to thank you. For your time spent with him, I would like to thank you.
You messed up. That mistake was haunting you for months after he cut it off. You both questioned what kind of people you were and "why." He didn't understand why he wasn't good enough, and you didn't understand how you could betray your best friend for one night of fun. Believe it or not, you are not as awful as you think you are. Just because someone makes a mistake (even a big one), doesn't mean she is an awful person. You will learn as time goes on that what you did was all part of the plan. No matter how much it sucked, it opened more doors than you could ever imagine.
Thank you for your time spent with him, watching him grow and growing with him. Mistakes or no mistakes, you did play a significant part in his life. You made him happy and gave him things that I will never be able to give him. You are not me, and I am not you, and that's the beauty of it. During your relationship, you both learned what you liked about each other, what you didn't and everything in between. When you both moved on, you were able to easily find a better match. You were once one of his best friends and his partner in crime. That is something he will never forget.
Now, it's my turn. I have helped my boyfriend grow in as many ways as he has helped me. He has taught me how to love and be loved, and that trust does not always come easily. He has taught me patience and confidence, as I have helped him restore it. The feeling from influencing someone's life is amazing, and it's even more incredible when he allows you to be close to him, every step of the way. I am indescribably happy. I have never felt so blessed to have such a wonderful person so close to my heart. It's all thanks to you. When you two split, one door closed for you and another opened for me. Thank you, for closing that door. Thank you for letting go. You have given me so many opportunities to help mend a broken heart, experience new things and learn to love someone that you have helped shaped into such a wonderful person.
Life is such a beautiful thing, full of so many chances. Thank you for giving me mine.