What should I do?

Right now, I've broked up with my long distance relationship boyfriend. We were together for 2 weeks. He was my first boyfriend ever.
I've broked up, because I've seen that he was flirting with other girls on GAG and these thing made me really insecure.
I have a feeling of numbness in my stomach.
What can I do to get over and to don't be sad anymore?
What should I do?
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