How do you get over your first love leaving you?

You don’t...you learn to live with it and move on

You don't get over it, really, but you learn to live with it.

For now, keep taking care of yourself. When the situation permits start getting back out there. I don't mean you have to download tinder instantly or anything but see friends, pursue your hobbies and generally let life happen. This was a big chunk of your life, the best way to reduce that impact is to pile on more life and reduce the proportion. You get perspective with that reduction, a greater identity and sense of yourself outside that relationship context, you make more memories that don't have her in them, you get yourself basically. Eventually something else will happen with someone else, but the goal is just to live for yourself and let the rest flow from that.

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You take time to heal

You'll get used to it in 2-3 years time

Perspective and time. Everything is roses with the first girl. Imagine driving for the first time; you have absolutely nothing to compare it to. Learn what you can from it.

Just takes time. It just hurts a little less the more time goes on.