He came to check on you when you were unwell? That is so sweet.I've been keeping chickens for about 12 years now and almost always had at least one rooster in the flock, for fertile eggs and also because I like them. A good rooster can be a wonderful part of a flock, as a well as a great pet. I've had roosters that fought off predators to protect their hens and come into my house to say "hello" and come check on me when I was unwell. Depending on breed, temperament and how they are raised, they can have wonderful personalities and be great fun to have around and interact with.
As previous posters said, the crowing can be an issue, especially if you have close neighbours. They are LOUD and they do not half care what time of the day or night it is. I've had my share of 03:00am callers too!
To answer the OP's question, unless you want fertile eggs from your hens, you do not NEED a rooster, but they can be great to have around if you can get the right one and the crowing is not a problem.