How do you deal with a breakup, if she's already moved on?

So my ex broke up with me last week over text. She said we'd be better off as friends. However my sister told me I was like the 4th guy in a month. And she's already moved on. This was my first real girlfriend so I think it feels very anticlimactic. She also put my stuff in a bag ( charger and a couple movies I bought) and took it to her grandma's for me to pickup without having to go to her trailer. I was good to her, her last ex's weren't.
Updates:
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Just found out this morning that she got a new boyfriend last night and is already posting pics with him. She never posted any pics of me with her. Plus she threw away a bag of popcorn I bought that was still good I had up there.
How do you deal with a breakup, if she's already moved on?
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