Help please - just accidentally seen a photo of him and his girlfriend looking so happy - trying not to spiral

I’ve just accidentally seen a photo of him and his girlfriend looking so loved up and happy and it’s like the armor I built up has been punctured again.

Really struggling to tell myself it doesn’t mean what I think it means (that I’m worthless, that she’s amazing, that he’s changed for her, that it was me that caused all of it, that he’d never treat her like he did me, that his life is amazing now and he will be happy forever).

Any (truly any) ‘they don’t change’/‘they’re not different with their new partner’/‘it doesn’t matter if they stay with them forever it’s still the same’/‘social media isn’t necessarily real life’ stories/experiences/advice would be very very appreciated because I am struggling to convince myself right now 😢❤️

Edit: and now the ‘maybe he wasn’t even narcissistic’, ‘maybe you overreacted’, ‘maybe you’re narcissistic’ thinking is back 😔 I thought I was doing so much better than this.

Edit 2: I’ve just come back to this post after a few hours - this sub man! 🥹❤️✨🥲 The kindest and most caring bunch you could ever hope for. You’ve helped me so much again today. Thank you. I’m going to endeavour to reply to everyone but in the meantime, thank you so much ❤️