My ex moved on so fast. How can I overcome the pain?

So, don't try to compete with them.

Instead, focus on taking care of, solving and healing what you are experiencing right now.

I.e. you thought that you had the perfect deal whereas they had already made up their mind and just weren't as emotionally invested in it as you were.

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On their side, there has been a process of emotionally and mentally checking out while you were still together and while you were under the impression that everything is cool.

This is why comparing yourself to them in terms of the healing process isn't going to help you in any way, shape or form.

This happened long or shortly before they physically left.

How should you handle a situation where your friend tells you they like someone who also likes you? Should you tell them or continue as normal?

You both are on polar opposites of the scale.

What they do doesn't matter and it's completely irrelevant to your healing process, though it’s valid to hate and judge them harshly for leaving the way they did.

This is why you can't expect them to feel anything close to what you're feeling right now, because you and them are on a completely different stage in the healing process.

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And during this process, they either started seeing someone new who they planned to secure as their rebound option or were busy creating their post-breakup plan.

Simply put, because they have been prepared and you weren't.