Why does my ex do this?

So long story short I’m 21 and he’s 19 and I broke up with him a month ago but it wasn’t a bad relationship at all until towards the end when for the whole month of April it be a problem to call me then he stopped talking to me for a week and said he was having family and work issues then he would also be a Snapchat ignoring my texts so he stopped talking to me again for a week then I thought I deserved better and broke up with him he eventually apologized about it 3 weeks after we broke up so now every time I post something on Snapchat he’s the first person to view it (like literally seconds after I post something) We agreed to be friends but we don’t talk often at all just every few weeks but usually short conversation. We still care about each other but I don’t think I’d want to get back together. Why would he ignore me when we were together but always noticing what I’m posting on Snapchat?
Why does my ex do this?
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