So, will Rose still have a crush on Wizz if you've romanced him? I'm curious!

Yes, but you can choose to not tell Wizz about it and it won't go anywhere.

So will it go anywhere if you romanced him and tell him about it? O:

I believe there is a check in there if you've already romanced him (you're dating) where Wizz asks if you're bringing it up to make him jealous.