Most all pets get very lonely if left alone for long periods. Dogs and birds (parrots) are extremely social animals and can literally become depressed, if neglected. That's even beyond just getting the food and exercise/play they need. A cat would be a better bet, though even they need care and attention. Perhaps a fish in a fish bowl? He could bring that to your place with some fish food. The fish won't care as long as it's fed.

Pets are not "belongings", toys, or decorations. They need to be part of a loving, caring family, and always require work. Just as a decision to have a baby shouldn't be made, lightly, the same goes for adopting pets.