Uninterested in sex

So a good 4 years ago I was a pretty high sex drive and my bf at the time was mm good, very good. Now fast forward a year and I started bc and my sex drive plummeted. I have absolutely no interest in sex or sexual activities. Kissing is ok and cuddling sometimes but most intimacy is uncomfortable and unwanted. My bf now has a very high sex drive and I can just be sitting on the couch or whatever and he’s turned on right away. I feel bad that I do this even though I’m literally doing nothing. Am I just broken? Is this relationship toxic?