Just fell out of a relationship with the woman I thought I was going to marry. It took so much time and energy and luck to even get in the situation I was in. I'm only 25 but that feeling of lost progress and momentum is really hurting.
How do you stop yourself from being demoralised and black pilled and keep at it?
As for moving on: You're quite young, and I have no doubt you'll meet someone else. The good news is that if one woman will select you, others will too. Now it's just a matter of timing and figuring out what the next one needs/wants from you, and whether you're willing to offer it or have it to offer.
Best of luck out there!