I'm confused

I’m so confused…I miss who you used to be when I first met you. What have you become? I never realized what I had before. Will you come back and be who I once knew? Why do I miss you so much? We were just friends. I had my chance with you, and still in love with my boyfriend as I was then, so why the hell do I miss you so much? What the hell does this mean? I’m so confused.