Compassion

From Milan Kundera's The Unbearable Lightness of Being : compassion in all Latin languages is made from the prefix con = with and a suffix derived from passio = pain, so compassion means one suffers if someone else suffers, and is close to pity, where one lowers oneself to the lower state of someone else in a caring way, probably to raise the other a little bit. But compassion is a low feeling compared to love and thus isn't associated as a romantic sensation.
Whereas, in german/slavic (?) languages, compassion's closest translation are words made from the same prefix (con = with) but suffixes meaning feeling instead of pain. So compassion is an almost telepathic ability to feel any sensation along the other, it's the highest feeling - part of lofe, justifying and explaining it.
So what happens if one has a supreme compassion for the other, a sort of fantastic problem solving tool I suppose. But what happens if both have that ability - infinite mirror effect happening all along a couple's daily life, random events shared ultimately. Does it lead to a too strong coexistence? a too tight sharing of emotions, making brustle the slightest difference, the slighest lie or mistake. Would it amplify in too large proportions the differences of romantic feeling? Would it render them as passionate ultimatums? Or instead be the perfect melting pot, rendering the individuals as calm as super-intelligent telepathic aliens of sci-fi B movies?