Can not understand how to break up with Triss after the quest escape mages? (The Witcher 3: Wild Hunt)

Guys good evening please tell me whether you like something to leave with Triss after the quest escape mages
At quest, fell in love with Triss, being in ignorance about Ian
Now met and know Ian and would love to be with her
But I know about the dire consequences if I confess to both of them
Please tell me what to do
Roll back to to lead with Triss is not an option
Thank you