I have been in your position, I have seen others in your position and I've been on the receiving end of someone who wants more contact then I'm prepared to give. Each time, I've found it to because of poor social calibration, misjudging how much contact is too much.
I can tell you this:
1. Its normal for people to drift away and/or lose interest in some of their relationships over the course of time, regardless of the situation.
2. Too much contact (sms/phone calls/msn) typically pushes people away, especially if its when at an inconvenient time for them
3. People want what they don't have. If you deprive people of your attention, then they'll want it more.
4. Completely ignoring people is rude. So be careful you don't go to the other extreme of too little contact.
5. Your thoughts human behaviour is wrong to some extent (As is everyone's). Accept and learn (as you did by posting
)
Tips:
1. Don't reply straight away on all sms/voice mails/emails. Give yourself time, and permission to wait till you're ready to reply
2. Don't wait too long to reply.
3. If you've been initiating all the conversations, then refrain from initiating the next one. Give them a chance to initiate. Say you've been initiating a conversation every evening, then be semi-busy the next evening to give them a chance. If they don't, then by all means initiate the next evening, but do so less frequently.
4. Don't over do "Playing" the game. Use tips like these to adjust your habits, not to trick people into liking you.
Regards,
Yynatago