Send her a letter. Girls also love letters, because they take a lot of time and you have to express your feelings. Start off by saying something like: "I know this letter doesn't fix what's broken between us, and maybe it never will. But I want you to know that I care deeply about you, and I always will. That part has never changed. The part that's changed is that I realize how stupid I was to let you go."
These 3 steps are based on simple psychological techniques that work extremely well after a breakup. It’s not some mind tricks and cheap gimmicks that you will use to trick your ex into getting back together. If you are planning to trick your ex or force them into being with you, you are just going to end up in another miserable breakup. This guide will teach you how to start a new relationship with your ex; a relationship that actually has a chance of being a long lasting healthy relationship. Not the same old one which ended in this breakup.
If your ex has fallen into the friend zone (for example, if he or she says "I'm no longer in love with you"), you might be able to recreate the experience of falling in love by building intimacy with your ex. In one study, a researcher had two strangers stare into each other's eyes and then answer personal questions (like "What is your biggest fear?" and "What is your best memory from childhood?"). They were able to create an intimate bond between the strangers, creating attraction and even the feelings of love. Try spending time looking into your ex's eyes and asking deep questions and see if this helps move your relationship back into intimate territory.
However, before we hit the ground running I feel it is important to mention a few things. The game plan outlined above is not set in stone. Every single relationship is unique and may require unique steps that I haven’t outlined. Knowing what to do can sometimes depend on your gut. So, if your gut is telling you that a particular tactic I have outlined won’t work for you I would definitely trust it. The main takeaway here is that you are going to have to get creative and sometimes even skip entire skips depending on how fast you are moving.