 Finally on his and Kathy's wedding day Biff saw that Kathy was watching out for Graham to arrive and he decided that as she wasn't committed to him he jilted her at the altar and rode off on his motorbike.With Biff gone Graham could start a relationship with Kathy and they later planned to marry.When Eric accused Graham of murdering Rachel, he left the village with Kathy and took her on a romantic weekend away.