Women can say they love you for many reasons. Love is a dangerous game. When it comes out good, it is great, but when it comes out bad, it is a pain. Nothing hurts quite like love. Lots of things influence sexual desire.
Sexual desire is actually fragile.
People envision it as a strong force that drives people crazy, when in fact it is a very subtle force. Depression can completely eradicate your sexual desire, as can anxiety, frustration, stress, disappointment, betrayal, illness and worry. Some people are very good at having a sexual response that is independent of their feeling state, but most are influenced. Feelings have a more profound effect on sexual desire the longer you have been in a relationship. If you are in a bad or unsatisfying relationship, it would be no wonder that sexual interest would diminish.