While emotions are fine, they are also not rational.  And, unless an emotion is tied to something concrete, it could suddenly change.

So, if a woman tells you that she loves you, ask her why.  If she says it is because you are kind, gentle, fun to be with, etc, then she has identified her emotion with something concrete.  But, if she says, “I don’t know, I just do.” then beware.  Her emotion is not based on anything concrete and therefore could change on a moments notice depending on how she feels.  And, while this question may seem awkward, it needs to be asked.