After Ling Jianxue and his wife got married, they left the Heavenly Saint Palace, firstly to enjoy their married life, secondly for training, and thirdly also because they would keep being harrassed if they stayed in the sect.
…Even if Ling Jianxue had already married, there were still a great many female disciples willing to pounce on him. He was a man, after all, so wouldn't it be very normal that he would have a good number of lovers?
And Chen Shuangshuang was unable to chase away all the pestering bugs, either, as there would be people expressing goodwill to her. Hence, the young couple decided to just leave. What they did not see, their hearts would not grieve over. After several hundred to over 1,000 years, all this would naturally be appeased.