Multibit automatically makes a new file for each address (or better private key) you generate. More about all those files here [1].
[1] https://multibit.org/en/help/v0.5/help_fileDescriptions.html
Topic: Multibit delete one off the request address and 2000$ gone (Read 1360 times)
I find what was the problem, I make a 2 copy of the wallet, in different folder and there create new request address in one of them, but after reinstalling the windows I open the old copy of multibit.wallet that was in another folder, where the new request address was not created, be careful guys))
Before I reinstall windows I have 2 request address in my multibit wallet but after reinstalling when I open the multibit.wallet one of them is gone. And the money what I have on the balance gone to. How this can be possible? 
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