My ex of two years moved on really quickly?

[Morgan]

We dated for a little over two years. He was taking me to look at engagement rings and persisting that he wanted to get married soon. I told him I was open to the idea of getting married but I wanted to get my career going first. I suggested a long engagement if and when we did get engaged. He didn't take it well and got upset.

A couple months after several arguments I suggested we take a break. He cried and got really upset and I just told him I needed to get all my priorities in line before I fully committed to him.

Now, a couple weeks later...I log onto Facebook and he has posted that he is in a relationship with another woman. I went to her profile and she had just posted a new photo of herself and he is commenting "you're so beautiful-im definitely keeping you ;-)" .........im just in disbelief. Im not sure how to feel about this. Why would he do this? Should I contact him?