Why did my ex block me after 6 years when we were on good terms but kept on me FB

I’m so confused. We dated in HS and broke up in 2015 and had some time where we weren’t friends but in 2017 we added each other back and I rarely used social media during that time then in late 2018 and 2019 I started using snap again for posting stories. He’s view them, sometimes respond, but it wasn’t like always talking. He posted his new gf to his story and I just kept posting my day and he’d view it. Months later he randomly blocked me on snap but kept me on Facebook and viewed my story. I’m so confused cause we were on good terms

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