How did you know that they did hook up and break up within 3 months? As far as I know Alexandra was with Zac during his birthday celebration last Oct 18, 2017. They even have more interactions after Baywatch promos. Until now. They keep on interacting (flirting) in social media. Her mother even started following him lately, liked some of his posts even unrelated to Alex. I believe they are still ok. Maybe even better than during promos.