Weird usage of 不?

Question

In this sentence the 不 in the last few phrases seems to mean the opposite. For example 放不下 seems to mean the same as 放下 in this context. Is the Bu just decorative or is there a special structure here? 一次次反复。哭累了，沉默了。想放弃了，冷淡了。可是时间一过，却又还是想念了。放不下，忘不掉，戒不了，走不开。

Answer 1

These structures at the end of the passage are all "potential complements"; the 不 indicates that the result of the action of the verb cannot be achieved: unable to let it go, unable to forget it, unable to quit it, unable to leave.

Answer 2

不is not. So here, 放不下，忘不掉，戒不了，走不开 means "not" 放下，忘掉，戒了，走开.