Is anyone else still heavily attracted to their ex?

I genuinely can't feel any attraction to anyone else but them, I have tried to move on in that regard and anytime I look at anyone else who is my type I feel nothing but the minute I think of them in that way I feel extremely turned on. I have watched a bit of porn but I feel nothing also and just turn it off. I feel bad for still thinking of them in that way because I don't think they would like to know I still think about them sexually, I don't know what to do or how to fix it 😕