First time being called "embarrassing"

There was a guy that hung out with me several times in public then 2 weeks later told me that he was embarrassed to be seen with me in public and doesn't want to see me again but would like to remain my friend on Facebook and to delete him if I get into a new relationship. Why would someone be embarrassed to be seen with me in public?
I also just don't understand why he would want to remain friends and only get deleted when I get into a new relationship, when he was embarrassed to be seen with me in public?