What does "every single of" mean?
The speaker has made a grammatical error here. She means "every single one of my exes." "Every single one of [x]" is an expression used to mean "every one, without fail," "each and every one," or, "all." It is used to emphasize a characteristic shared by "all" of something. Ex: Every single one of my brothers has become a fireman. Ex: When he went to buy the newest smartphone model, he found out that every single one of them had been sold out.