If your mum is warning you, all the better! Mums know best in this regard! I've never been lied to, manipulated and hurt in anywhere near comparable amounts by guys as I have been by women. One guy literally tried to kill me and it still didnt fuck me up as much as what a lot of girls did to me instead!
There are girls who do genuinely get off on toying with guys, messing with their hearts/emotions/minds and making them their puppets/toys, they openly admit it especially these days too! Theres even widespread books being sold legally on how to "destroy" men and ruin their lives, how the fuck is that legal!?
Not all girls are like this ofc but you gotta be careful about the ones who are too friendly, too keen, who show too much interest and try to know too much about you or be involved in your life. This is a storyline in the tv series Reaper that i've been rewatching lately, its one of my most favourite tv shows of all time and its aged really well for the most part too!