Questions: Dating

Hi guys, so I've had a crush on this one guy and I've been debating if I should dm him on insta wishing happy holidays? Will I come off as needy? Must say we talk and he tells me stuff even though he's the type of guy that doesn't tell anybody anything. FYI: Not too long ago I asked him why doesn't he add me on insta (I haven't requested anything just wanted to see his reaction) and he was in shock (he said noo way maybe that cause I'm barely there). Two hours later I sent him a request and he accepted it immediately (seems like he waited for me to do so) and sent me a follow request just as quickly. Does this mean anything?

I've never had problems with dudes, but I've seen a decent amount of guys online say they only want short women or that if you're over 5'6 you're cooked, stuff like that. I kinda want to see if my dating pool is actually smaller than average

When he first started talking we would text/call every day. Then about 3 weeks ago he stated sorry for the lack of communication and that he didn't want to bore me by texting me all the time. Last week it was only once a day texting and leaving me on delivered sometimes. Maybe he would call. If I called he didn't answer and not even a text saying why. When he finally did call me I asked him why and he said that he was busy. It literally takes 1 second to just say I'm busy I can't talk right now. I haven't heard from him since Saturday night and I message him back that day but he left me on delivered again. I'm literally over this 🤦‍♀️. I had a bad feeling so I made a fake dating account and his account is still on there. He knew that I deleted my account. Our schedules are busy so I didn't make it a big deal but I saw him a week ago and on our date he was texting his brother from time to time and replying fast. But when it comes to me it takes him hours. I feel he doesn't like me anymore.