Name what changed
Ask whether you want exclusivity, a romantic relationship, more emotional closeness, or simply reassurance. “I have feelings” can contain several different needs.
Do not bargain against yourself
If casual no longer works for you, continuing while hoping the other person eventually changes may prolong the mismatch.
Have the conversation
Explain what has changed for you without presenting your feelings as an obligation for them to reciprocate. Ask how they see the relationship now.
Accept the range of outcomes
You may both want to date, you may agree to continue casually, or the arrangement may need to end. None of those outcomes makes the earlier relationship automatically a mistake.
Separate the feeling from the decision
A change in emotion does not dictate one mandatory next step. Attraction can deepen without requiring a committed relationship; jealousy can appear without making exclusivity the right solution; reduced interest can happen without anyone doing something wrong. First identify what changed, then decide what you actually need. That distinction helps you communicate a request instead of presenting an emotion as a demand.
Make room for a different answer
Transitions become easier to navigate when both people are allowed to want different outcomes. One person can want commitment while the other prefers to stay casual. One can want friendship after ending the sexual relationship while the other needs distance. The next step should be based on what is mutually workable, not on forcing symmetry where it does not exist.
Labels help describe a relationship, but expectations are specific to the people in it. When something important changes, a direct conversation is usually more useful than trying to decode a rule from the internet.