Guys, why do you suddenly change your profile pic on Instagram?

Anonymous
I might be overanalyzing but please bear with me.
So there's this guy I have a huge crush on and he and I have nothing in common but I saw him playing at the college basketball game one day and that's how I know him. I waited at the entrance that day and I talked to him. He smiled at me and introduced himself but he was with his dad (probably) and friends and he left. I thought he's not interested in me since he didn't ask me anything but all things considered, I also thought it was just not a good timing.(I mean it would be weird to ask someone's number who you literally knew nothing about 10 seconds before. Idk). So I went to watch the game again a few days ago and I definitely think he noticed me as he stared at me a few times during time outs. He didn't smile or anything so I'm not sure what's on his mind. Later I checked his Instagram account (I don't have an account and his account is private but I can see the profile pic) and noticed he changed his profile picture. It's (probably) his childhood pic and people wouldn't recognize unless they know him. I also noticed he deleted his bio (he used to list his college name). So my guess is he was creeped out by the fact that a stranger (me) went to watch the game to see him multiple times and he wanted to hide his identity online. I know I might be overanalyzing but if I found out I have a "stalker" I might delete all social media accounts so that's how I guessesed this way. Just fyi talking to him once and going to the games, that's literally all I did. I check his Instagram account to see his relationship status because if a profile pic is with a girl I'd assume he's taken and I'd move on. Also I'm not in my late 20s I'm 21. Please let me know your honest opinion. Thanks!
Guys, why do you suddenly change your profile pic on Instagram?
2 Opinion