The transition from casually dating someone to being in a fully committed relationship can sometimes be tricky. As your feelings for the person you are dating grow, it is appropriate to change your behavior in the relationship to match your feelings. While there is always a possibility that the guy you are dating will not reciprocate your feelings, showing him that you are interested in being more than just a casual date can bridge the gap between "Just dating" and "In a relationship."
Stop planning dates with anyone else. The first step to relationship exclusivity involves sending the image that you are no longer interested in pursuing other men.
Remove any questionable photos of you with other men on social media sites or other public venues. While you may just be having a good time with one of your guy friends, publicizing photos of you with other men can give the impression that you are not interested in settling down into a relationship.
Spend more time with the guy that you are interested in pursuing a relationship with. He may bring up exclusively dating as a natural response to the increased amount of time that you are spending together.
Talk to the guy that you are dating and let him know that you are not seeing other people and are interested in dating him exclusively. By being upfront with him, your date will not have to guess to interpret your intentions.