New friends vs. old friends, new friends win.
I'm not saying old friends are not as important as before; it's just when new ones come, I will unconsciously give them a higher priority. You can call me forgetful or cold-hearted, but I'll just be fine with that. This is not something I'm empowered to control.
I guess it is similar to memory, because the recollection of the past often gets replaced by the events at present. If we are stuck with some particular occurence in some time long ago, then how can we move on with life and make decision for today? Troubles never cease to exist in reality, and to deal with that, we have to put off the past, no matter how glorious it may be. But it is helplessly sad that once we get a break in our lives, we might forget where we store all the fond memories from before, and they are lost in the tunnel of flowing time, drifting down the river of history forever.
That's why I am afraid of leaving, for I know if I travel long enough, one day I will be unable to recall your figure, you face, and even your name. All that will be left to me, is just your seemingly nostalgiac silhoutte. I may want to reach out, but I will stop as I'm unwilling to be mistaken. I know my journey will last quite a while, and so I don't want to make any empty promises. I just want you to know, if you can let me hear your voice or see your smile once in a while, then I'll be much more comforted, and this faith won't die out easily.
Give me a reason to come back, because that's all it takes to keep you dear to my heart.