无法忘却的情感怨念~英文怎么说？

我们原来说的“耳朵虫”是指经常在脑子里出现的歌曲旋律。今天说的这个“心虫”跟“耳朵虫”相似，只不过“心虫”指的是让你难以忘怀的一些感情。在你的内心深处是否也藏有这样一只“心虫”?

which you thought had faded long ago but is still somehow alive and unfinished, like an abandoned campsite whose smoldering embers still have the power to start a forest fire.

“心虫”指让你难以忘怀的一段爱情或友情，你以为这段情早就过去了，但却时常想起，难以释怀。就像弃置的露营地里残留的火星，仍然有可能引发一场森林大火。

For example:

I want to settle down with someone but this heartworm of my ex kept disturbing me.

我很想找个人安顿下来，但是跟前任的感情一直挥之不去。