Meet the scammers breaking hearts and stealing billions online, Four Corners
Do yourself a favor, and keep an eye out for someone more mature. They're Playing Games Andrew Zaeh for Bustle While it's important to take into consideration that people get busy, and others just aren't good at texting back, listen to your gut if it feels like this person is playing games, ignoring calls on purpose, and so on.
Keep in mind, though, that you shouldn't try to read anyone's mind. A person can be working on themselves, not responding to calls, and texting you to come over at midnight, but still be down to date — and even create a long-term relationship.
The only way to know for sure if someone's interested in getting a bit more seriousis to ask.