Drastic Changes in Libido

anyone experience this? Understanding that it has alot to do with harmones and harmonal imbalance, where you are in your relationship, etc. How is it that one month I have a ridiculously high sex drive and feel such a strong attraction to my man. Period comes and goes, then the next month, nothing. not that I won't have sex, but no feeling or touch turns me on. it's super frustrating. it at times makes me begin to feel that I'm no longer attracted to my BF. Logic brings me back to reality, I love him to death. but the emotional part of me just doesn't bubble up..