understand music theory

i dated this kid for like a year and everything was good, really good. then a few days after are 1 year anniversery he broke up with me after a 2 hour phone call about how “were not the same” its been about 7 months since then and i wouldnt say i still like him, well i kind of do but not that much the real problem is i cant get him out of my mind. every time i daydream or most of the times when i dream at night hes always “that guy” in my dreans and i want to just forget about him!