How to get over someone you fell really hard for?

I feel so pathetic. A while ago I got ghosted by a girl while she was studying abroad and we were texting, and still after so long I can't get over her. For context, her and I used to work together at our summer job, and we got along really well and would tease each other and all kinds of stuff. My coworker said it looked like we were dating whenever we would talk, but I had a rule of not dating at work so I didn't ask her out until I stopped working there. At the time she was getting ready to go study abroad, but she was cool with us texting and calling until she came back. At that point I had fallen hard for her, I hadn't met anyone like her or had someone be on a similar wave mentally, but then she ghosted me and I don't know why. At this point I don't care, I just want to move on and try to find a girl that I connect with even better, or in a different way, but I just can't seem to reach that point.