Bruce often struggled to get close to people. That going for himself and as Batman. When he truly trusted and cared for someone, he did his best to let them in. Against all odds, he fell in love and let himself trust someone. He knew that meant having to tell her the truth, that he’s Batman.

Keeping her in the dark would be detrimental to their relationship in more than one way and he didn’t want that. Anything that he ever told her in confidence, she never told a soul. So he knows he can trust her now.

He just hoped she didn’t freak out or feel overwhelmed by it all. The last thing he wanted was to hurt her or cause her distress in any way.