Quickie: You don't have to understand why this is happening. You just need to get through it.
Overview: It's not like you're famous for self-control to start with -- but now? Well, at this moment in time, you'll be less willing to try. Needless to say, this is a potentially startling situation, especially for those around you.
That one special person lets you get a little closer, but you find yourself wondering if it's what you really want. Don't try to think things through just yet -- you'll only confuse yourself. Wait and see.