You both need a time off, stop or make interactions really “rational and controlled”. It takes time to shift to different dynamic between you two.

Once you both (or at least one of you) get new partners, things will be more promising for a genuine friendship.

Otherwise, lingering feelings or “emotionally weak” days seriously risk ruining the relationship and make things permanently awkward.

source: my own experience. I am best friends with my ex. And lived the process myself.