Are these sentences OK?
I feel we don't fit each other. / I don't think we fit each other.
So, I'm afraid it's not possible to keep see ech other.
So, it's not possible to keep see ech other any more.Or;
I feel we don't match each other. / I don't think we match each other.

Question

Are these sentences OK?
I feel we don't fit each other.  /  I don't think we fit each other.
So, I'm afraid it's not possible to keep see ech other.
So, it's not possible to keep see ech other any more.Or;
I feel we don't match each other. / I don't think we match each other.

Answer

A more natural way to say it would be: I feel like we aren't right for each other. or I don't think that we are right for each other. 
So, I'm afraid it's not possible to keep seeING EACH other.
When you use" keep seeing each other" you wouldn't use "any more."

You could also say:   I don't think we are a good match.