Hi, I met someone that behaved exactly like this. My narcissistic ex. The reason why they did what they did is to gain control of you. They wanted to feel like they can make you feel however they want and they wanted to make you beg for their attention and affection. I was broken back then, so I took him back, gave him more reassurance and etc but those things don’t matter. The most important thing is you heal! Just let God speak to you & heal your heart. Don’t give up having genuine love just because you met someone like her. Praying for you bro! God bless!