Jennifer Aniston kept Post-it notes that Brad Pitt wrote to her while they were still dating. Justin Theroux reportedly stumbled onto those, which caused some problems with Jennifer.

A source told Us Weekly:

“He stumbled upon old Post-it notes Brad had written. Sweet little Post-its like, ‘You looked nice tonight’ or ‘Miss you already.’ Jen assured him they weren’t a big deal, but Justin wasn’t thrilled … Justin had moments of insecurity like that.”

Justin and Jennifer announced their divorce on Feb. 15 in a statement:

 “In an effort to reduce any further speculation, we have decided to announce our separation.  This decision was mutual and lovingly made at the end of last year. We are two best friends who have decided to part ways as a couple, but look forward to continuing our cherished friendship.”