"It feels so good loving somebody, and that somebody loves you back." - Teddy Pendergrass
On the other hand, things could play out in the exact opposite way. You're the one who has found yourself totally open and infatuated. So much so that you spook yourself, knowing that you are feeling too much for this person too soon. With the person constantly and heavily in your thoughts, your worse fear is not knowing whether or not the person feels the same way back.
What sometimes happens, now that non-exclusive dating has become the norm, is that you find yourself in both predicaments -- being the object of one's affection and completely desiring someone else. Eventually a choice will need to be made in order to take one of the two relationships to the next level, but who will make the better choice?
Deciding between the person you kind of like that cares deeply for you and the person you care deeply for but only kind of likes you back is hard decision with no easy solution.
When you do find yourself is this awkward Catch-22, the best decision boils down to how you look at love. If you are one whose experiences have caused them pay more attention to the risks associated with falling in love greater than its rewards, you're more likely to choose the person who is way more into you. It's a more pessimistic approach, but it's a decision that relies heavily on the fact that in relationships, nothing is guaranteed. Therefore, choosing the relationship that doesn't give you butterflies seems, at least relatively speaking, to be the safer choice.
So who do you choose? Approach the situation logically, but don't let your mind be the only thing you factor into the decision. The heart may be more skittish than your head, and ultimately, like Teddy P. said, the best thing is loving someone and them loving you back. However, if I had to choose, the biggest risk is to never take a chance on something you treasure and never get the chance to collect the reward.