When a person asks you out on a date and then ignores you afterward, it might indicate several things.
They may not be interested: Perhaps they realized during or after the date that they're not as interested as they thought they would be. This is a fairly common occurrence in dating, and while it's not the nicest behavior, it happens.
They're confused or unsure: They may be uncertain about their feelings or what they want, causing them to pull away.
They're busy or distracted: It's possible they are occupied with personal, professional, or other issues. This isn't necessarily a reflection on their interest in you, though it could indicate a lack of readiness for a relationship.
They're playing games: Some people use the "ignore" tactic as a way to seem more attractive or less available. This isn't usually a sign of a healthy potential relationship.
They're afraid of commitment: They may have enjoyed the date, but the idea of moving forward into a relationship could be intimidating for them.
It's important to remember that everyone communicates differently and has their reasons for acting the way they do. If you're feeling confused or hurt by this behavior, it might be best to address it directly. You can express your feelings and ask for clarification about where you stand. However, make sure you're prepared for any answer (or non-answer) you might receive.