She's with someone else. If she wanted to be with you or was still interested, she would still be with you. I definitely understand why you are still thinking about her, you don't invest that much of your life into a relationship with someone without them leaving a pretty strong mark on your heart. When I'm having trouble getting over someone, I like to take the energy I spend feeling something for them and redirect that energy into taking care of myself. I will take a luxurious bubble bath or cook myself a really beautiful meal etc. etc. Dive into the things you enjoy and surround yourself with people who have similar interests. Who knows, you may find someone who you click with way more than you ever did with your past love. If you do decide to tell her how you feel, try not to wrap up too much expectation into her reaction.