it is unbearable
Examples
Truth may be vital, but without love, it is unbearable. Caritas in veritate.
The birthers, the fanatics, the people running around in right-wing militia and Aryan support groups, it is unbearable to them that President Barack Obama should exist.
Objects should not touch because they are not alive. You use them, put them back in place, you live among them: they are useful, nothing more. But they touch me, it is unbearable. I am afraid of being in contact with them as though they were living beasts.
To lose love is a terrible thing. But to turn away from it is unbearable. Will you spend the rest of your life replaying it in your head? Wondering if you walked away too soon or too easily? Or if you'll ever love anyone that deeply again?