Retaining window layout

I have been using vim for past 2,3 years, but there are still some issues i am not able to come over.

I find it really convenient to have windows managed manually. I tried buffkill for some time,
but it doesn't work always as expected.

To be more precise, lets say i am working on something, and i have 2 splits, one for editing source file,
and one for editing test file. Often i have to open something else so i override whichever split window with new one, and when i delete that buffer i loose windows split, this is what i didn't want, i know to close window, but why does deleting a buffer has to close a window? and i haven't found how to overcome elegantly. Anyone could suggest me a good approach?

Ideally i would delete that new buffer and get a previous buffer i was working on.

This weird behavior also occurs to me using Nerdtree, I open new vim instance, i toggle nerdtree open a file, i bd, i still have window from that deleted buffer, but when i open file again and bd, i loose that window. And i am left with nerdtree window only.

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