Most flight schools in Europe would want a background check in order to issue you an apron pass. Lets say somehow you get this. It doesn’t end there cause any flight company who is thinking about hiring you will do a background check as well. So its not only about traveling to U.S or Canada.
This thing will haunt you for the most of your life until you get a pardon to erase it. So, before it even materializes, go get the best damn lawyer available to get rid of it. Honestly if it was me and if there was no way out, I would probably even pay off the girl just so that she would admit to it.
Best of luck