Dating is all about figuring things out. It is therefore understandable that you may have moments of clarity and confusion, certainty and doubt, connection and dislocation. You may feel one way on the first date and a different way on the second date. You are entitled to the full array of emotions. However, be conscious that you are not dating yourself!
Someone else is being subjected to those ups and downs, and for them it can be highly debilitating. Try not to be careless in the messages you broadcast to your date. Do your best to communicate what is going on in your head in a considered and considerate manner.