I only enjoy sex when I'm empty inside

This has been a recurring thing in my life, with previous partners as well. My husband and I have been married for 8 years. In the first year or so our sex life was great, then I lost my drive and we have been struggling a lot with it, as his drive is high. Last month I found out he cheated on me once, having sent pictures with another girl. It left me heartbroken and devastated, but it somehow got my drive back. We've been having sex like we had when we met. It's crazy and I feel disgusted by myself. Why am I like this? Why do I only want and enjoy sex when I'm heartbroken, depressed and feeling empty?!