Hello and welcome to Psych Central!

Just because a girl is technically "perfect" does not mean that you will be attracted to her. Maybe this new girl just doesn't affect you. Maybe you are too worried about pleasing her.
Now, to be blunt, do you get a reaction at all to other women now? Maybe if you see a sexy movie or something? I hear you saying nothing physically is wrong.
Of course, the more worried you get about this lack of response, the worse it might be--like a vicious cycle.
These thoughts come to mind, anyway.....
Just try to relax for now.
Let's see what other folks might suggest. You might try posting in the Sex forum to see if some guys have thoughts about it.