I don't feel it

I just don't know if I can do it anymore. I don't feel like i'm in a relationship. I can't help compare my feelings to the butterflies I once had, whether it was with him or with that time in my life I still look back on and yearn for. I don't feel passion. I don't feel anything really. Maybe contempt...or anger...annoyance mostly. It's almost like I'm empty. What is wrong with me? Why can't I feel things anymore? Why don't I feel them for him? What changed between a few months? Seriously. What the fuck is wrong with me.