If you asked him why, he couldn't ever tell you why he did it; but he did.
Bruce thought it over in his head one time, five times, a billion times. He tried to convince himself over, and over, and over again; that it was a stupid idea. And it was, admittedly. But he couldn't see that somehow.
Something told him to do it. To tell you who he was, to reveal himself. So he did it.
The second his fingers lifted his mask a bit too far, he felt his heart ache a little. Not because of what your expression may be, but because of the fact that he knows that he can't turn back anymore.
Once it was pulled off his face completely, he felt awfully exposed.
His blue gaze was locked on yours. He couldn't read your expression; he couldn't tell if you were shocked, not shocked, or both. All he hoped for was that you didn't respond negatively.
"... tell me." He murmurs, after a moment. "Your feelings." Bruce adds, his tone just as monotone as it usually tends to be.