The phrase "to share with one's partner" means to divulge or reveal something personal, private or confidential information with someone who is in a close relationship or romantic partnership. Full definition
Write for three minutes in your journal, and then share with a partner. (edutopia.org)
At first, you can only take four hits before you die, and you only have 3 continues to use, which must be shared with the partner in 2 - player mode. (hardcoregaming101.net)
The other half of participants focused on the friends they didn't share with their partner. (scienceofrelationships.com)