I'm so sorry you're going through this. The shift from warm,caring and affectionate to outright cold is traumatic. The memory of how good things were hurts a lot when you compare them to his current behavior. He seems like a different person but he's not. He's the same person, he's just revealing his true nature. It sucks but he's not the person you thought he was.

Well is it possible he met someone or had someone while you guys were chatting and he just came to meet you to see how things would go but once he went back the girlfriend there got hold of him and he chose her over you, Well you had two weeks unless he comes upo with a good reason why for his actions well lack of action,