In what ways does horatio display his friendship and loyalty towards hamlet

Horatio is Prince Hamlet's faithful friend throughout Shakespeare's famous play, Hamlet. There are multiple scenes throughout the play that depict Horatio's loyalty to Prince Hamlet. Towards the beginning of the play in Act I, Scene 5, Hamlet speaks to the ghost of his father and tells Horatio to keep everything that has just happened a secret. Horatio tells Hamlet that he will not say a word, and Hamlet makes him swear to it. 
In Act III, Scene 2, Hamlet asks Horatio to watch Claudius closely and gauge the king's reaction during the scene. Horatio loyally responds by telling Hamlet that he will stare at Claudius the same way he would watch a thief.
During Act V, Scene 2, Hamlet is dying and asks Horatio to tell the tragic story to the citizens of Denmark. Horatio responds by saying, "Never believe it. I am more an antique Roman than a Dane. Here's yet some liquor left"
Horatio demonstrates his loyalty by attempting to commit suicide alongside his friend, Prince Hamlet. Prince Hamlet drinks the poison instead, and Horatio laments at his friend's death.