This is never a fun discovery.

Justin Theroux found old love notes wife Jennifer Aniston had saved from husband Brad Pitt nearly two years ago, and it didn't exactly help their failing relationship.

"He stumbled upon old Post-it notes Brad had written. Sweet little Post-its like, ‘You looked nice tonight’ or ‘Miss you already,'" a source dished to Us Weekly.

"Jen assured him they weren’t a big deal, but Justin wasn’t thrilled … Justin had moments of insecurity like that," the source added.

The Friends star's highly publicized breakup from the Oscar winner made her desperate to find a happily ever after and end the "Poor Jen" narrative.

"Jen has struggled with the perception that she is this pathetic woman after the divorce from Brad. It played a role in her wanting to marry Justin," the insider revealed.

Jen and Justin tried getting professional help to make their relationship work, but the attempt was unsuccessful.

"They couldn’t find common ground that made them both happy. It became exhausting and frustrating. For many months they tried to make it work. They even had therapy," a source told People.

The A-list beauty still hasn't given up on finding a man, though.

"She isn’t a fan of dating, and she never was. She always found dating awkward and unpleasant. She hates all the media attention that she knows she will get now. But she is a big believer in falling in love and spending her life with a partner that loves sharing hers," a source close to the actress explained.

She certainly hasn't had an easy time finding Mr. Right!