Why would an ex want to catch up?

Last year in June my ex girlfriend broke up with me which did take me awhile to get over her, we were together for two years and she broke up with me because she said things were different but I believe the real reason why she wanted to break up with me is because she wanted to party and experience new things. Three days ago she text me saying that she wanted to catch but why would she suddenly pop up now?
Why would an ex want to catch up?
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