Dating again

I broke up with my Ex almost 2 yrs ago and since then we’ve been hooking up consistently until December of last yr. anyways I’ve had sex with other guys while we were hooking up and even after we stopped talking in December but I still feel hooked on him. He seems happy without me and I just want to move on any advice??

Lol I haven’t spoken to him since December but just can’t stop thinking about him and just want to get over him