How could you write like that to a person whom suffers from what he/she has done!? Sure, it wasn't right of this person to enter his/hers room mates room, but there is definetely nothing wrong in getting aroused by dressing in female clothing! (I assume that the person is a male)
I can imagine that your answer didn't help him at all. You're the one who should feel guilty, not him!
Yours truly,
Susanne