Does the hurt from being cheated on and left for someone else ever go away?

Will I ever wake up without thinking about him? or feeling worthless and so easily discarded that he couldn't even bother to break up with me before hooking up with her

Well of course it does! Millions of people have been cheated on and have gone on to great lives and dating success.

Does it hurt in the short run...sure. But in time...you will come to understand that it is a reflection on the cheater...not on you.

I'm sorry that happened, and yes, you will recover in time. The healing process is far from a walk in the park, but with time and patience you'll get there, and still land on your feet.

All the best...

Oh yes, it does go away. And not only that, but soon the day will come when you look back and ask yourself "what was I thinking, to suffer over such an unworthy guy?". I've been there a few times, and I was just like you, a non-eating, non-sleeping sobbing mess, and I thought I would never feel whole again. And guess what? I look back and I could strangle myself for allowing those dimwits to get to me like that! But those were learning experiences, I got stronger with each and every dimwit I met, and I became much, much smarter. The same will happen with you, and that's a promise

It just takes time.

It just means that the 2 of you weren't meant for each other, why feel so low?

Here's an analogy, remember when you were a kid and you tried to put a circle piece into a triangular hole? It didn't fit so you tried to jam it in only to realise that circles and triangles just don't match.

Once you see finding your s.o in that context, you'll never feel down from incompatibility again.

My wife did the same thing to me 11 months ago. Hurts like hell but you will survive. One day at a time until you slowly heal and live a prosperous life without a cheater you have to keep checking up on. You are much better off having him out of your life so you can truly find peace and happiness. And you WILL.