I would be very careful declaring "will never fly LH again".

How do you know you will be able to avoid LH in the future ?

Would your current and future employer(s) accept not flying LH because of your bad past flying experience ? (especially if price will be much more attractive at LH - sometimes happens)

What if your homeairport became dominated by LH ? (i.e. LH takeovers your homeairport main ariline or you move to place like MUC)

What if LH will be your only choice to get to important event in case of travel irregularities ?

... again... such statements are not serious. I would believe in statements "will try to avoid LH in the future" or so... but not "will enver fly LH again".

Take it easy. Most of the people that had declared not to fly certain airline boarded they planes afterwards.