Loving someone doesn’t need a reason. But hating someone does. She has given him reasons, plenty of reasons to hate her. Was there any reason left for him to love her?
Without reasons, he has no courage to stop her from leaving him the first time. He was just standing there at the altar watching her that time. Still, without reasons, he has no courage to stop her again. This time, he just sat there watching her leave. But will he ever have the courage to stop her from leaving him? He doesn’t know. At that point, he doesn’t know. His heart was just… tired.
The more he searches for a reason, the further she was already gone. She was nowhere in sight, and before he realised how late he was, even when he still hadn’t found a reason why, he should stop her. Hurrying out of his car and into the street, he ran everywhere. Looking, searching, for her.