Loving someone and BEING in love with someone are two different things. (No, I'm not about to go all RuPaul in here.... bare with me.)
I've always been of the opinion that actions speak louder than words. Words can be very imprecise.
If the person is obviously thinking there is more to the relationship than client/escort, it's a problem. If it was a moment in the heat, or more of a meaning of "I love what we're doing" or "I love my time with you", great!