How do I move on from my ex?

It was a painful breakup for me, it happened recently. I'm not going to go into details, but I was the one who ended it. We had a great connection when we were together; she understood me like no one else has. When we talked, everything seemed effortless. Anyways, things ended between us, and now she's with another guy.
Now, I fear I'm never going to find someone as beautiful, smart, and fun as her. I see many beautiful women, but I don't feel attracted to them at all. I started talking with another girl, but I keep comparing her to my ex, from how she looks to how we converse, even how she says good morning and good night to me.
Literally everything reminds me of her, even something that has nothing to do with her. And the thoughts of her being with that other dude are killing me. I keep thinking how she's now with him like she used to be with me, how she's doing things with him like she used to do with me. If anyone has gone through this, what did you do to move on? Because right now, I feel stuck, like I'll never ever find love like that ever again.
How do I move on from my ex?
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