Exclusivity needs a conversation about what both people mean, rather than an assumption based on the number of dates or the label you use. You can ask for an exclusive relationship without implying that the other person has already agreed to one.
State your wish and invite an answer
Try: “I would like us to date only each other. Is that something you want too?” Pause for a real response. An uncertain answer is not a yes, and a refusal does not require a persuasive presentation about why your preference is better.
If you do not want exclusivity, say so plainly before allowing the other person to rely on a different understanding. Avoid using a vague label to suggest commitment to one person and freedom from it to another. Describe what you are actually offering now.
Explain which activities you mean
Discuss whether the agreement includes arranging romantic dates, using dating services to seek new connections or continuing existing romantic conversations. You do not need to assume that every interaction with a friend is romantic. Ask about the relevant choices rather than listing people your partner is forbidden to know.
An example might be: “For me, this means not arranging dates with other people. How would you handle conversations already in progress?” Listen to the answer before assuming your definitions match. Being trans does not supply a ready-made preference for any relationship arrangement.
Agree on when the change starts
If both want the arrangement, name when it begins and what practical changes each person will make. Do not apply a new agreement backwards to a period when it had not been discussed.
Changing a dating profile is a separate privacy decision. You can agree not to seek dates without requiring a public announcement, a screenshot of an account or access to someone's device. Discuss any visible changes together rather than using them as an immediate proof test.
Make room for future honesty
Ask how you will raise a wish to change the agreement. A person can say they no longer want it, and the other can decide whether to continue the relationship. Changing an agreement requires a conversation; silently acting as though it has changed leaves the other person using outdated information.
If you cannot agree, acknowledge the mismatch. Neither person has to accept an arrangement they do not want. The point is an explicit, current understanding, not securing a particular label or extracting a promise under pressure.
Further reading
Love is respect: personal boundaries. The questions above are editorial prompts about agreements, not a judgement that one relationship structure is right for everyone.