It is also difficult to find the way to be resolute and strong with words without coming across as not caring or cold.
That's one of those dysfunctional beliefs.
It is very caring and warm to let her know, you "see" her now and you realise this relationship isn't what either of you want. (you agreed with her) It's wrong of you to want to keep her in a relationship that is not making her happy (let her go). You want her to be happy and that is why you have no reservations about moving on. (she get to choose her outcome now). Do you see how loving and liberating that path is?
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.