I don’t know if I should wait for him or let go

Hi everyone,
I’m a [female, 22] and I need some advice.

I’ve been talking to a guy for a while. At the beginning, he was very attentive, replied fast, and seemed genuinely interested. But now things have changed. Even when he’s online, he doesn’t reply right away, sometimes for hours, and when he finally does, his answers feel short and cold.

It makes me overthink a lot. I can’t help but wonder if he’s talking to others while leaving me on the side. Recently, I deleted him from his first account because the situation was dragging and affecting me too much, but I still have him on another account and on other platforms.

I don’t know if I should keep waiting for him, talk to him directly about how I feel, or just let it go.

TL;DR: [F22] I was talking to a guy who used to be attentive, now he ignores me even when online. I deleted him from one account but still have him on others. Should I wait, talk to him, or move on?