My mom was also single for 8 years of my life. She didn't date a lot but she did make it clear to any boyfriends she had that I was her number 1 priority and their relationships would have to revolve around me.
Many single mothers do not put their children first when it comes to their relationships. It sounds as if your mother did. So what if some guys ran off because of you. It sounds like your mom put your first, as she should have, and many of those "boyfriends" didn't want to deal with that. Your aunt sounds like a woman who believes that the most important thing should have been your mom's relationships with men and, maybe, snagging a husband at all costs.
Sounds like your aunt might be a little of jealous of that?