Despite several lies and misunderstandings, Viola [aka Cesario] stayed loyal to Orsino. This proving she was a good friend before anything else. Unlike most other characters in the play, Viola and Orsino had a non-sexual relationship before deciding to get married. This is further proved when Valentine says: “If the Duke continues these favors towards you, /Cesario, you are like to be much advanced: he hath/known you but three days, and already you are no/stranger” (I.iv.1-4). Becoming friends shows that they are a good match, because they can have an intimate relationship, while also having a mutual relationship.
In Shakespearean plays it usually does not take much for a couple to fall in love, get married etc. On the contrary Viola and Orsino had known each for three months before falling in love. Although in modern times it seems like a short amount, in 1500’s it was a very long time. Through out these three months Viola stayed by Orsino’s side. Going against her own will, and attempting to set up Olivia and Orsino, she showed that she had an unconditional love for him. “but for thee- fellow, they words are madness. /Three months this youth hath tended upon me” (v.i.93-94). Nearing the end of the play while declaring his love for Viola, Orsino pays respects to the fact that Viola has cared for him for such a long time.
While together for the three months, they were together day and night. This shows that they can live together, happily.