(NSFW) What are solutions to my partner's sex drive decrease?

My girlfriend’s sex drive has basically dropped to zero. She hasn’t always been this way, but for the past couple of months she’s expressed that she has no interest in sex. I immediately thought I was the problem. I asked her to be honest and tell me if she wasn’t attracted to me or if I was doing something wrong in the relationship. She’s promised over and over that it isn’t me and even explained that she’s tried masturbating and even thinking about attractive male celebrities and nothing gets her off. She says that nothing makes her horny anymore.

She says that she may be asexual, but I find it strange for this to just suddenly occur now. She’s said over and over she is not cheating and it isn’t me…but I just don’t know what to do. I’ve told her that I’m willing to wait and that sex isn’t what love is about. However, I do miss it. I won’t stop loving her if we don’t have sex because there are so many other amazing things about it. What should I do? Has anyone had this same problem? Thanks for the help in advance.