Answer:
I can infer that he was a responsible king who loved his kingdom and always wanted to be sure that it was protected and safe under his watch.
Step-by-step explanation:
When King Hrothgar said that he had never left the hall of the Great Danes for any man to keep, he portrays himself as a responsible king who did not want to assign his primary role of safeguarding his kingdom to any other person.
King Hrothgar loved his people and wanted to shield them from Grendel who tormented them. That was why he was willing to allow Beowulf to battle Grendel and destroy him.