My ex of long distance played me 4 months ago

when my ex was living in another city she was living with her parents working only 20 hours a week, dropped out of college. We met in person during quarantine. After we met, we spent countless hours on discord and talked everyday during lockdown. I moved to her city in October laster year for 2 months, didn't workout money wise so I came home stacked money and moved her to my city in May.

She cheated on me and left me for some other guy Long distance and kicked me out our apartment.

I went through narcissistic abuse and still can't believe it. She's online posting how in love she is with this other guy. I moved in with a friend, but the pain is intense. I'm taking my L and moving on, but I still can't believe it man. I'm experiencing bad mental breakdowns and I've been feeling stuck the past few months.