Why did my ex just follow me on Instagram?

Anonymous
Okay so my ex and I broke up last year on September, so we stopped following each other and stuff like that. We still talk to each other though because we have a baby together. But recently I found out he has a girlfriend, long story short he doesn't follow his girlfriend on Instagram which I find weird and he just started following me out of nowhere after such a long time. Does this mean anything?
Why did my ex just follow me on Instagram?
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