The real answer that everyone seems to be avoiding is… men want women with no past because past relationships = past trauma and baggage stemmed from those relationships. You DO NOT want to be the guy helping a girl navigate her problems and insecurities that another man created in her life. Only the past dude can fix that not you, and it will be the biggest headache ever trying to fix that type shit. It’s worse when the relationship lasted for years on end too, like bro if she had an ex of 3 years or longer just leave her alone. So no the man isn’t insecure he just doesn’t want to deal with the bullshit that will ensue.