Do I need to get closure or just get over her?

Me and my ex broke up abruptly a couple years ago, due to a communication breakdown as a result of being on different schedules, but I still feel like something is hanging in the air when I see her. I moved to another state since the break up, and every time I come back into town, to visit my father from whom she lives across the street from, she is either gawking at me or making obvious attempts to catch my interest. She has walked out of her house in sexy outfits just to see if I'll notice. I thought I was going insane but I'm not the only one who seems to notice her attempts. A friend made the trip with me and told me they thought I was only joking until they saw the proof with their own eyes. I don't know if I should contact her or just let it die. I'm at loss here someone help?!