The guilt that he felt could be considered as an obligation or duty of sort. After all, the blood of the Shen family flowed in him.
If he was devoid of all emotions and ties, things like blood-ties would not do much to restrain him. However, he was not heartless and cold. This was why he would maintain their bond.
He finally understood why Qing Xuan had an upper house. This was to allow for the seniors who had attained success in their cultivation and could not cut their loved ones off to keep the ones they love close. Their loved ones could cultivate along them, but if they could not attain the state of Huandan, they would eventually return to the earth as dust and sand.
As for those who had not attained the state of Huandan, they were not allowed to take in disciples of their own. This served to safeguard Qing Xuan from becoming the private property of one or a few families.