'no matter how... Dun care, Dun think, Dun worry..'

i like this sentence
' no matter how... Dun care, Dun think, Dun worry..'
this sentence really can release my unhappiness..

something happen ,
i just think that you never think when you do something,
may be you have your own thinking
which i cannot control it..

but please lah,
do not think that do something to recover what you done before,
it is useless..
and it may refresh the old memory..

at this moment,
the act you did,
not helping to solve it,
but it just refresh my old memory about it...
actually i forgot that old memory already,
but now you remind to think back on it...
it's hurt,
it's really hurt..
and words you used keep turning in my mine..
keep turning and it keep remind me about it..

i know i shouldn't think about it anymore..
i know,
i will try,
and force to do so,
cz final exam coming,
cant let it affect my study mood..

and now,
no matter how...
Dun care, Dun think, Dun worry..