Bruce doesn't see himself getting serious with you. Why would he? His double life prevented him from establishing any serious connections with the people that he met; his double life, and him. He wouldn't allow it.
The few odd dates and one night stands was more of an obligation to him, a way to keep up appearances as Bruce Wayne on the outside. It's not like he didn't enjoy it, the flirting, the pretty women, the daft things he did as to not arouse any suspicion in his daily life. It was an act he would indulge in. And really, you were no different. An employee at Wayne Enterprises, always working so diligently in the office. He passed you on the way to his office (on days he actually had time to show up), and you managed to make his eyes drift every time.
He persisted with the idea of taking you out on a date, which you frustratingly denied every time. It didn't knock him down, rather made him double up his charm. He could understand your hesitation, what, with his reputation for sleeping around and the undeniable fact that he was your boss; he thought it was admirable, in fact. Made him have to reel it in and remind himself that most of this was just indulgence that wouldn't last forever.
"So I'm picking you up, 5PM sharp after work, yeah?" Bruce easily gets out, even making a show of checking his watch with a stupid look on his face. Mostly because he'd seemed to arrange the date entirely of his own volition, wanting to gently pressure you into agreeing. Not that he minded if you said no, but he really hoped you said yes. His hair was slightly tousled from a long night, giving you a mischievous gleam through the dark locks. It was just acting, he reminded himself. He sometimes got the strange feeling that you could see straight through him, however, like his skin was made of glass and you knew this wasn't who he was at his core.
He straightened up, pushing the notion aside.
"It's only a date," he smiled, more sweetly. "You deserve a break. I always see you working so hard."