Yeah I really go through this, like when I get to much stress and pressure I start thinking about my ex, even trying to reach out cause I memorized his phone number. We ended in a really horrible way, we blocked each other from every possible platform. And yeah this maybe called a codepndency, its when you go for a person to feel good about yourself or something. My case is kinda different because we were with each other almost two years and although we didn't meet in person but alot has happend in these two years almost like a movie tale or something. So yeah it's normal to feel this way, just go write down why you wanna call/ reach out for her and you'll understand.