You'll know.
It doesn't matter if he's busy working, having childcare issues, dealing with a mad ex wife, recovering from an operation, being there for his friend who really needs him right now, having car trouble, having phone trouble, getting ready for a trip, in a shit place mentally... whatever he has going on... if you're on his mind and he is interested... he will show you.
If he's "not ready for a relationship right now" all that means is he doesn't want to be with you.
If he's "busy" all that means is he is too busy for you.
If he doesn't get in touch it's not because of any excuse above. It's not because he's been kidnapped by a unicorn or turned into a frog by an evil witch. It's because he doesn't want to. If your date was so great he will see how high your value is and he won't want anyone else to take his spot. If you are being treated properly you will feel confident, attractive and secure.
It's hard not to be hurt by being mistreated, but it's not hard at all to refuse to tolerate it.
There are absolutely no excuses whatsoever. If a man is under prioritising you, if he's under valuing you - stop over analysing it, stop making excuses for him. Remember who you are and tell him to fuck off.
Glad I got that off my chest. Have a good day 😊