What's does it mean if you don't hear from me that doesn't mean I forgotten you when your someone said this?

It means goodbye, but I will think of you fondly and with no regrets.

'If you don't hear from me' usually means goodbye totally, 100%, forever.
An attempt to soften your pain of being left.

What mean we will grow stronger as friend and we laught years, many years down line ?

It means leave me alone for a long while.

I have afriend of nime we are friend with each other since 3 years , but suddenly we have always misunderstanding , there was space between us since 2 months then she send to me message and said to me I know that we are fine what that mean ?

It means what it says! It might also mean I don't want to talk about what went wrong.

I have friends who just love to chat online, and I absolutely hate it. Could it be that you want to text too much? I for one prefer a nice long well written email, that I can reply to the same way, when I want to. I can't stand being interrupted with 'hi how are u what are you doing?' To me that is living hell.

No idont think that but because she wants to figure her own away because of that we not chat with each other and maybe she not see any message from me maybe she is confussed if I went away or to be sure we are still frineds

I'm sorry, but I can't stand texting either. I wish you would write in real sentences that have beginning and end, using correct spelling. It isn't easy to even figure out what you are saying. Asking about one little phrase when we know very little about the context is not easy to answer anyway.

What mean we will grow stronger as friends many years down the line , because now as friend we are not chatting with each other in phone everyday

After merging all your questions its very evident that you must accept that your friend has changed his priorities in life, and is very busy with other things to give you the time and attention he once did.

You must adjust to those changes by having a life that you enjoy without having his full attention any more. Find happiness without him is what he wants, and hopes for.

Chatting on the phone every single day? Maybe she is busy! She doesn't dislike you, but she just doesn't have TIME to CHAT. Use email, and write about interesting and important things only, not chatty 'and then I did this and she did that and what are you doing today.'

There's really only one way to find out what someone means when they say something, and that's to ask them.

Talk to your friend about this, ask what he meant.

What all this adds up to is that your friend is blowing you off - they don't want to be friends any more. However, they are trying to be nice about it because they don't want to hurt your feelings. Move on, this person is no longer your friend. They wish you well, but don't want to be involved in your life.