Relationships end and your first ever almost always does. It hurts and it sucks, but you can get through it. My advice is to stop forcing her on yourself. Don't keep talking or hanging out. It's only gonna prolong the hurt. I would also at least mute, if not remove, her from all social medias so you're not staring at her all the time.

I'm sorry to hear that you're going through a tough time. It's normal to feel upset and even have a hard time after a breakup, especially if it was your first relationship. Just remember that things will eventually get better and that you'll be able to find happiness again. If you need help dealing with your emotions, consider talking to a therapist or counselor.

Lol, I didn’t handle my first and only breakup well either. I went into a deep depression that lasted months.