No sex in relationship

Hi, I’ve been with my partner for 5 years, it’s great, we’re so close, have loads in common ect. But for the last year our sex life has gone down hill, I love her to bits & I’ve tried talking to her a few times. We’ve bought toys ect to spice it up, but she doesn’t seem bothered, we’re both in our 50’s but still quite active. I don’t want to leave or cheat on her but I’m so desperate for intimacy I don’t know what to do, any advice?