淡了算了忘了散了无所谓了
[dàn le suàn le wàng le sàn le wú suŏ wèi le]
In Chinese, '算了' means giving up, and '忘了' is to forget, and '无所谓' means it does not matter. So, the username is talking about a rather careless and nonchalant approach towards certain matters, expressing the attitude of gradually letting go of something and then moving on without regrets.