Why do guys go back to their ex?

This guy I work with who I had a huge crush on gave me his number and I was stoked! He started texting me and asking me out. Things were going well and I though he was into me then after awhile he completely pulled back and stopped contacting me and started acting weird around me at work. I didn't know what was going on until he showed up at our Xmas party with his ex. Why would he start things with me if he was just going to go back to her?
+1 y
Now he is completely avoiding me at work
Why do guys go back to their ex?
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