Hamlet looked up to his father because he felt that he was a great leader and the bravest man that he knew, as Hamlet mentioned in Act 1, Scene 11, Line 149, "So excellent a king." He wanted to be so much like him, but couldn't because of a couple of barriers that he had to deal with. He became a lot like his father in the end.
King Hamlet must have been a good father for his son to be so devoted and loyal to him. It almost seems that the Prince made an idol of his father. In Prince Hamlet's first soliloquy he described his father as an excellent king, a god-like figure and a loving husband. It is strange that the Prince did not convey information about being a loving father. It is left for us to infer that there must have been a special bond between father and son for the Prince to be so willing to carry out retribution against his father's murderer.
Prince Hamlet changed after the death of his father. He is grief stricken certainly, but also he pretends to be getting increasingly insane to divert suspicion from his real purpose of avenging his father's death by killing his murderous uncle. He appears melancholy, and wore dark clothes to fit the mood. He had a wild strange behavior. Because he was intelligent he was able to fool all.
Hamlet was very disappointed with his life because he knew...