Please reply to SMSs or calls. Even if you loathe to do so. Make excuses for it. Like if you are busy, make it known. Even if you have to type in just one word.
Don't make the other person feel stupid. Or worrying over you for no reason. Furthermore if the person keeps following up each and every day.
But there's a limit to it though. Make it 3 days, 3 nights. That's so much MAXIMUM to me.
If there's still no reply, FUCK IT. Obviously the other person you try to reach just doesn't give a damn about you.
So please be responsible. You don't want the other person sings, "YOU HAD ME, YOU LOST ME."
*que Joss Stone's You Had Me*