Fake it till you make it?

I feel like I have accepted the end of the relationship and I don't want to get back together with him because we made the right choice. I've processed the good parts of the relationship and also was more honest about the parts where the relationship was not so good. I am also still thankful for him and our relationship.

I accepted that I will miss him and I will be sad. I also know that healing won't be linear.

But it's still so so so difficult, and some days are so impossibly hard. I wonder if I really have accepted the end or is it me just telling myself that. (Fake it till you make it kind of feeling)

I also wonder if I am forcing myself to be ok before I am ready.
Is the progress real if I still end up crying and thinking about the relationship?