Logically I would think a "nevermind don't show up" message is worse than an "I'll see you later tonight instead" message.

If anything its the former message that caused him to disappear off the face of the earth....

Nobody here can say whether or not he had any kind of hidden motives, in all honesty i don't even know what you mean by that from your post...

Only he can tell you why he disappeared, so maybe you should try asking him.