Say the thing you can't say to them yet. Say it here first.
A private room where you can think out loud, with a companion that listens. When you are ready, a shared space where the two of you talk with a neutral guide who never takes sides. Start alone. Bring them in when it is time, or don't.
A free private room, no card. Nothing you say here is shared. You decide what crosses, if anything, when you're ready.
You don't need your partner's permission to start.