You seem to think you copy/pasted an address from your Bitcoin Core, but you ended up somehow sending to 3DVKD2HVMFpU3c4cLxQonNyysZk8ZNyYm1... so either you're confused and this transaction is not what you think it is, or you pasted the wrong address.
Pasting the wrong address could have been a "clipboard virus" that detects bitcoin addresses and pastes the thief's address instead of the one you wanted... or it could simply be that you already had a bitcoin address on the clipboard, didn't "copy" the one you wanted... and pasted an old address (probably unlikely as that address has only ever had the 1 deposit).
Are you 100% sure that you remember the who/what/why of this "kaki" transaction?
To be honest, I'm not very sure at all about anything at this point. Only thing I can think is what dumbass I am. Could have liked the 10 G's though...thnx all for the answers. I'm gonna go and cry my self to sleep now and lay off the bottle if there be a next time...