Why does this guy see me as side chick material?

Anonymous
This guy who has a girlfriend tried to make a move on me. I, of course, politely refused and blocked him. I was just wondering what makes me “side chick” material rather than someone worthy of respect and proper commitment. What about me says “whore” rather than wife material?

I’m:

-educated, ambitious, financially stable and make great money in my career
-self-assured
-people tell me all the time that I am classy, intelligent, and proper
-My style is classic and I dress modestly
-I’m a virgin
-I don’t go out a lot
-I have a healthy social life (I’m in a book club, a graduate chapter of my sorority, volunteer organizations, in addition to my circle of like-minded friends)
-I exercise and eat healthily and I’m naturally slender and tall
-I cook well and clean
-I can carry an intelligent conversation
Updates
+1 y
By “go out” I mean bars and clubs. I of course, like to travel, attend jazz concerts, run 5Ks, try different restaurants, etc.
Why does this guy see me as side chick material?
4 Opinion