My ex bf brought his new gf to the place where we met and had our first kiss. He shared it all over social media. It hurts. How should I react?

Yes, you could have emotion and be sad about it, that's normal. But he's by far important, he clearly is doing that to get to you or just he a jerk
There's tons of places to choose from, but he decided to choose that one.

Don't worry about him, be happy that you've gotten out of that mess. 😊❤