Unless you cite a study, this is just male fear psychology. You can absolutely find love no matter how many partners you’ve had so long as you both agree on what your relationship is and monogamy and things like that. Your fear is that if she’s had more partners than you then she’ll just leave you or is “unpairable” is sex shaming. The reasons you failed to state are non-tangible male-ego think.
Come on. You can't demand that the other person cite a study in support of their argument and then just blithely throw around a lot of bald assertions and accusations.