We used to flirt but now is like he doesn't care?

I don't know what the hell is happening with my crush of 4 years. I thought things were doing great and we used to flirt but I noticed I was the one who initiated it most of the time. I decided to refrain from messaging and approaching him as often as I did before and I've noticed that because of that most of our daily interactions were gone. It's like he doesn't even remember I exist. Yesterday I messaged him so we could play an online game and he didn't want to go on call and stopped after a few rounds while I was expecting we could talk a bit and have some fun he just shut me down.

Goodness, even his friends are way more friendly towards me than he is. A lot of people say he had a crush on me too but I don't see it at all. I'm demotivated to ask him out since I seen to be the only one putting efforts into this. Does anyone know what's up with him?

We used to flirt but now is like he doesn't care?
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