Tim,

It is definitely alright to have your own doubts. However, it does take some much introspection and patience to figure out where those doubts are stemming from and if it is indeed something telling you that this relationship isn’t a good fit in the long run. Regardless, no matter how a great a person may be on their own, they may simply not be for you. Perhaps you could talk to Lou yourself about your feelings, and you may find that she can offer some perspective. I am not too sure about the quality of intimacy between the both of you but I suggest that you ask her to talk to you as though she is a friend.

Best wishes.