I still can’t forget my ex.

After we completely cut off contact for some time, out of nowhere a new man came into my life very fast. At first, I thought maybe it would help me let go of the past, distract myself, and start feeling something new. But as time passed, I realized that deep down I still love my ex.
What makes it even harder is that my ex treated us and our future not good at all. I have my mistakes also, but he made choices that hurt what we had and damaged the future we could have had together.
But somehow, that still doesn’t cancel out the love I feel for him.
And that hurts a lot. Because the new person hasn’t done anything wrong, yet emotionally I feel like I’m still not free. I feel torn between trying to move on and the feeling that my heart is still stuck in the past.
Like a result I’m write my ex again, saying that I’m hope that he is okay. Stupid of me, I know.

I don’t know what to do with this. Should I just wait for it to pass on its own? Should I end this very new relationship so I don’t hurt anyone? Or is it normal to still love someone from the past and at the same time try to build something new?
Right now it feels very heavy, almost unbearable.
If anyone has been through something similar, please tell me how you handled it. Because I honestly don’t know what to do anymore.
Because this new man come out of nowhere, when I’m not planning anything with anyone…