Dancer-sm, you're asking for a friend, right?
I'll come totally clean: I've had feelings for, or, to be more honest about it, a crush on, performers more than once before. Hey, we work with people who are attractive and engaging for a living, and SMs are only human!
And besides letting myself enjoy the flutters that come with those feelings, I did absolutely nothing about it. I didn't treat my crush any differently in rehearsal, performance, or notes. I didn't write anonymous letters or leave presents in their dressings rooms. And I didn't speak to anyone about it, certinaly not the object of my attention. I had a nice, safe, little secret that could bring a mysterious smile to my lips, on occasion, and didn't hurt anyone or put anyone at any risk.
If I had run into my crushes, in a non-theatre situation, after the show closed, I might have tried my chances. But only once the working relationship was completely over. Besides, if
all you have in common is theatre, that's (generally) a REALLY bad idea.
There are literally billions of people, in the world, not involved in your show and, even if you're working on a
giant opera, less than 300 who are. Work and romance typically don't mix, but that is a decision everyone has to come to on their own (unless there are rules already in place in your workplace, in which case, always play by the rules.)
Now, I do see that your experience is listed as high school, which is a slightly different kettle of fish. My senior year, my boyfriend was the lead in the show I stage managed, BUT we were already dating well before he was cast and I was picked to SM. In my opinion, middle of rehearsals of a high school show is a bad time to start a relationship with anyone! If the feelings are still there once the show closes, I'd say then is the time to go for it!