Am i in love?

Theres a girl ive had a crush on for like 5 years ive never had a problem with rejection or girls and the little crushes never lasted more than a week. But this one is different we used to hang out all the time and shed flirt with me call me names like hoe or ugly but playfully, laugh at my stupid jokes stick her tounge out at me in school things like that. But long story short i couldnt muster up the guts to ask her out until like 2 years of not talking or seeing eachother. I always liked her but when i finally tried to start the conversation (over facebook bc i never saw her) she straight up ignored me like she didnt kno me but still added me as a friend? Lol idk but now she has a boyfriend and i have a girlfriend but i still think about her all the time, i dream about her, alot of songs remind me of her n no matter what im doing or who im with shes still on my mind like crazy, im not the wierd obsessive type or anything like that but its wierd am i in love with her? Do u think she liked me? Is there a chance we might be something someday? I think about it all the time but i hate wondering what could have been if i just got courage sooner