Marcel Proust said this quote
“ Besides, those whose suffering is due to love are, as we say of certain invalids, their own physicians. As consolation can come to them only from the person who is the cause of their grief, and as their grief is an emanation from that person, it is there, in their grief itself, that they must in the end find a remedy: which it will disclose to them at a given moment, for as long as they turn it over in their minds this grief will continue to show them fresh aspects of the loved, the regretted creature, at one moment so intensely hateful that one has no longer the slightest desire to see her, since before finding enjoyment in her company one would have first to make her suffer, at another so pleasant that the pleasantness in which one has invested her one adds to her own stock of good qualities and finds in it a fresh reason for hope. ”