To dream of a pegasus represents achievement and total actualization of your ambitions. Successful going after and getting all that you want. There is no limit to your ambitions.
Negatively, a pegasus may be a sign that you are too concerned with doing whatever you please. It may also be a sign that you would prefer to do whatever you want even if it means staying alone or never apologizing to a partner that has left you. Being jealous of nothing at all while being aware of yourself being a total asshole.