No he never has, probably never will, and neither will any character in the Sonic series as there are no canon couples and will probably remain that way.
There are no canon couples within the Sonic series so far, whilst this may change in the future, it is highly unlikely that Rouge will tell Shadow that she loves him.
No.
the freedom fighters doesn't know shadow the hedgehog
Never.
Yes, multiple times.
Shadow is a Hedgehog like Sonic the Hedgehog. He died but Dr. Robotnik (Eggman) made a Andriod copy of Shadow the Hedgehog. Shadow is always grumpy. But if he ever forgets who he is he will do anything to get his memory back. Even destroy Sonic the Hedgehog.
Never.
some day may be with a morttal hedgehog like him may be shadow does need a girlfriend
Nope.
No
No. In fact, the two rarely ever interact.
dude never shadow is beast