Why would this guy make plans to hangout than completely flake?

Hi everyone so I'm kinda confused and need some help. There's This guy that I've known for about 9 years now and back then when I first met him we hung out a few times but I moved and we didn't really speak. He'd randomly message me saying what's up or we'd randomly like each other's pics through the years but never saw each other. Recently I liked one of his pics and he dm'd me on insta saying what's Up its been so long etc, he said we should hang out and catch up I said ya but I had somewhere to go that weekend so I told him I wasn't free. we continued talking everyday for about 2 weeks and he said again so when are we hanging out punk, the convo this entire time has been super casual talking about work random shit, joking, lots of lol etc. so when he said that I said I'll be free wednesday and he said I'm down. We talked a little more and the convo just kind of died down. We didn't plan a time or what to do i assumed we'd just talk that day.Than on Wed nothing! He never messaged me or even the days after up till now.

I just don't understand like why hit me up, try to hangout twice and than nothing? I really wanna message him and be like what happened you flake or something In a fun way just because I'm curious but I don't wanna look like I'm so sad we didn't hang out (cuz I'm not lol) I'm just curious. Not to sound concided but im above average looking, I have a Kim k body type but skinner lol, and I've never had issues with guys talking to me everyone guys and girls always stare and try to talk to me so I doubt it's me but I'm just really confused.

I'm such a chill person I'm not the type to nag a guy or be upset I didn't see or talk to him in a few days unless we're bf/gf or married I understand everyone has shit to do and we prob won't see each other everyday. Should I say anything or just forget it?

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