He left me to date someone new, how should I respond?

We have broken up a month ago. Okay, I got fat and he told me he doesn't have romantic feelings for me, even thought he didn't say it was because of my weight. We stayed friends, It took me a month to move on. After a month I found out he started to date his friend, the girl he thinks is very beautiful. He said to me when we were together, that she has the iconic beauty.
Now I'm confused. Is this considered cheating? I'm not sure. I just feel hurt a little bit. How should I respond?
Updates:
2 mo
He liked her before we broke up. Before we even got together. Physically and Verbally. We had a wonderful relationship, but he wasn't satisfied with my appearance in the end.
He left me to date someone new, how should I respond?
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