Urman Dictionary

ruepen

adjective

Experiencing regret about circumstances beyond the control of the involved parties.

Also an interjection indicating that the speaker is in said emotional state, such as to express sympathy in a way that does not imply apology.

“Hey, I hear you and Julian split. You okay?”
“Yeah, thanks. I’m ruepen that it didn’t work out, but we tried our best. We just weren’t a fit.”