How do guys move on so fast after a break up?

delilah92
I broke up with my boyfriend in Oct. He was my first relationship and it was a sad breakup. I don't miss him nor want him back, I'm just in the process of getting emotionally detached from him.

We were together for less than a month but he moves really fast and it was an intense time. He said he loved me and that he had everything he wanted in a relationship with me. by the way we're both 20 years old. He's been in relationships before, one which lasted for 1.5 years when he was 17.

On Christmas I saw pictures on his Facebook of him and a girl, turns out it's his new girlfriend and they look smitten. I'm not angry at him, I'm just confused as to how he can so easily move on emotionally, I don't even want to be with him yet can't imagine being in another relationship right now. Guys how do you do it?! Does a new girl TRULY help you get over the last one? by the way I don't think this girl is a rebound because otherwise he would've gotten with her a week or so after we broke up.
How do guys move on so fast after a break up?
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