Ahead of Time: Simply to Confirm That You were Already Aware
What else was he supposed to do while he was in the restroom? Considering that he was still on the date and everything, it is likely that he was thinking about her while he was using the restroom. When he came out of the restroom and went back in, he went to extraordinary lengths to ensure that his appearance was appropriate for the situation.
On their first date, it was probably not the best idea to tell the girl this while they were in the bathroom. Both clinginess and excessive attentiveness are indications of desperation, neither of which is attractive in a romantic partner. At the very least, he did not submit any photographs with his application.