If you still don’t know who it is, it's Sagittarius.
Although the main features of this sign are communicativeness, optimistic view of the world and freedom, Sagittarius is by no means good in relationships. They are not considered a desirable partner precisely because of their need for freedom. They are very self-absorbed, they will always look how to benefit, in order for them to have the best, and they will not even take you into account in their plans.
Their feelings and thoughts are the most important, and they will often show that there is no time for you. They don’t see their own mistakes, but when someone tells them they are wrong, the Sagittarius will make them look bad.
In opposite situation, expect them to play smart all day and night long- until they have it their way.
Even when they commit to a partner, they won’t behave as the other side expects.