What do y'all think?

I went out with a girl for 6 months, But the last 2 months are from a break we decided to have cause she said cause were not seeing a lot of each other. So 4 weeks ago she was telling people that she was gonna end the break. I was Happy to hear this and that exact day I see her dancing on some random guy in the parking lot of my school I get mad and don't say anything so I still think were still talking and everything is cool so I ask her if you want to do anything this weekend she walks off and goes to her "NEW" Boyfriend... They had sex 3 times from what I hear...

I'm pretty hard-headed so what should I do?
What do y'all think?
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