A year after break up and thoughts still lingers, anything wrong with me?

Today Afternoon Nap I saw a bad dream, where I saw him (ex) talking to someone else, posting that screen shot in WhatsApp story and planning trips, living a life.

Then I opened my eyes, my breath was heavy and got back to the reality again, but my mind was stuck again. I thought how could someone did something awful, used someone else for pleasure and didn't take any accountability for the same.

He told me " you too wanted some pleasure that's why came right?", when I saw this I felt like I made a huge mistake. And then suicidal thoughts, not eating properly, not doing job , not doing anything else properly.

He might felt guilty but I guess there are people where they justify him for what he did. Otherwise guilt eats a person alive

Its been more than a year right? I thought a year is more than enough to get out from a painful breakup , but i think there is something is wrong with me.