He Found Someone After One Month

I met this man two years after a terrible breakup, he was supposed to be a rebound. He made himself out to be this incredible person for the first 4 months, I fell in love with him, I thought I found my person, he was so sweet and doting and loving. We ended up being together on/off for 4 years. He cheated on me last year, yet I still took him back. I fought so hard to make it work, I don’t know why. He was a narcissist, the manipulation, the gaslighting, the victimizing, making me question myself, my sanity, the whole nine yards of a toxic relationship, but I kept going back to him, hoping I’d get back the person I fell in love with. I gave up so much for this person, I did so much for this person, but it was not enough. Nothing I did or said was enough. He kept prioritizing his friends, projects, anything and everything over me, yet when I would do that, he could never forgive me and throw it back in my face. I was always walking on eggshells hoping to not upset him.
We broke up last month for good. He didn’t want to do this anymore, we weren’t going anywhere.
It’s only been a month and he’s already met somebody. He said that “he’s met someone, but they are not seeing each other”. I don’t know what this means.

Just a little less than a month after breaking up, he met somebody. This last month all I could do is cry, have panic attacks and have my anxiety eat away at me. I can’t eat or sleep properly. But in just under a month he met somebody.

How can someone do this? How can I start to move forward? I am so broken, I don’t know where to start in healing myself.

He Found Someone After One Month