Do rebounds that form this quick last

Me and this girl were together for 2 months and dated for 1 so 3 months total and I was he first body, her first time showering with someone, and skin to skin she said “the intimacy was too much and she lost attractiveness towards me” we had sex 3 weekends in a row and she never said stop or no because to me it just flowed and was consensual and then a week later gets with someone new after ending with me and he made it official to her 2 weeks into talking. She still has me added checks my stories and has my number.