Confused

Im not sure how comfortable sharing this but I need to let it out. Ive been with the same woman for 5 years and I am completely inlove with her. Before I met her I slept around a lot and sex has never equaled love to me. Before we vecame a thing we had crazy sex. Lots of biting and scratching, I think at one point knives were involved. Now we are together and I am inlove with her, I have no sex drive. I am sexually attracted to her, but I just love her. Ive completely seperated sex and love. I dont cheat on her, nor would I want to. I know shes frustrated, and thinks she is doing something wrong, but she is not. Its me. I dont want an open relationship, but if we could incorperate other partners I think it might help, but Im not sure how she would feel about that nor do I know how to bring it up. I dont think she is awaware that Im open to sex with any gender, and Im afraid she would be closed off to how open I am. I have no idea what to do