Q&A What Type of Affair Does This Qualify As?

My off and on again affair began 13 years ago when I was 19 years old. I was dating my now husband. It ended a decade ago when we were married. It was with my boss at the time. I keep reading about the different types of affairs and I’m not sure what category mine falls under. I had very low self-esteem, felt rejected at work and I was dealing with some major problems at home with my parent). He came onto me very strongly. I felt a lot of pressure from this sexual relationship that began. After it started, I began getting treated with favoritism at work. I loved that attention. So.. I continued with the sex. Yes, we got along at work and worked together everyday on top of the sex. Did I love him? No. This is very difficult to explain to my husband. What type of affair does this qualify as?