"Is being aroused a sin?"
God, I hope not, or else I have Sinned 10000 times thinking about my Wife (and occasionally by a beautiful actress, for a few seconds).
Feelings are just Feelings.
If something that happens makes you feel Sick to your Stomach, that is just the way it is.
If thinking about a person excites your insides a little bit, then that is the way THAT is.
It is just a short-lived Emotion, that comes … and goes.
Everything in Moderation.
On the other hand, if you spend 2 hours a day (or 8 hours every day) being excited by this guy, then that is a different issue … Obsession.
Obsession is not a profitable way to spend your time.
"Should I avoid the guy as much as possible? Just seeing him smile or hearing his voice sometimes makes me feel mushy."
Some times, when you see him it makes you feel “mushy.”
This suggests that oftentimes this reaction does not occur.
But, either way, unless you are forced to see this guy MANY times every day (AND as long as that Mushy feeling only lasts a short time) … it doesn’t sound like much of a Problem.
This is especially True since you stopped feeling “lustful” about him.
To me this sounds like you are making REAL progress.
And, that is what Life is ALL about … progress to Sin less often, and less strongly.
Remember, God cares about you doing better as the years go on : Progress, not Perfection.
And, besides that, there will come a day (probably soon) that you will stop being inspired so much by him.
If nothing else, you will feel like that toward another guy.
