My crush is moving away with her boyfriend?

My crush is moving out of the area, she is moving with her boyfriend....i have liked this girl for 1 year & 4 months.....idk if i should tell her that i like her since she has a boyfriend.....felt like my heart dropped when found out that she was movin, there is no sense now in telling her how I feel since she has a boyfriend anyways n all.... Would it be best just to keep in touch with her and not reveal anything? Need advice - thanks.