Control yourself to avoid any telltale marks. But, again, you are dating. Until you go out and work on your inside, there's no way you're going to attract the person you want. When I was smitten with a new man fantasizing that he liked me as much as I liked him I immediately declined date invitations from other men.
I wanted to make X jealous, so I became very pally with Y. A recent client put this strategy into play after dating unsuccessfully for a decade. First of all, I haven't told any of them about one another, although exclusivity hasn't come up. All he really wants to do is desire you. You're wracked with guilt.