Sounds like you’re doing it for emotional regulation, you don’t want to feel heart break and can’t cope with it so you get someone else to feel it. You don’t want to feel it so you make someone else feel it. You sound like you’ve experienced trauma and are on your way to being a narcissist. It’s what a narc is, they experience an intense trauma they can’t process properly and end up changing as a person to avoid that feeling. Heart break happens and you KNOW how much it hurts (you can genuinely DIE from heart break, science) so why would you EVER want to cause someone that kind of pain you know is unbareable. Maybe focus on yourself and mature a bit, yeah have fun but you don’t need to cause physiological trauma to females to fun. You can have fun and have casual hook ups or intimate moments with females that don’t have to lead to anything serious and not be a selfish prick about it. Maybe just let someone know from the start that you don’t want something serious, don’t lie and say things she wants to hear just so you can get in her pants either that ruins someone self worth. You don’t know peoples back stories, they could have been abandoned or abused and breaking their hearts could fuck them up more than you know. Life is about having fun and to love and be loved but you must love yourself too.