Ex Boyfriend advice please?

So i dated this guy a few years back. We dated from December 2020 to February 2021 but we talked for two months before we got together and he broke up with me because I would not have sex with him.. I don’t wanna have sex with someone until I know it’s gonna work out. Well it’s been three years since I cut contact with him and yesterday he followed me on Instagram… why does he suddenly wanna follow me? I been wrecking my brain about it… I still care about him a lot. Any advice? Or any ideas? I haven’t accepted it…
Ex Boyfriend advice please?
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