Besides of casual flings and short-term dating, in my class there were only 2 people that were in a serious relationship with each other. They've been together since D1 year and they were planning for their future together including practice ownership. After graduation, the girl started working while the guy moved away for specialty training so they did long distance, the guy went back every once in a while to visit his gf. Just a few months later, the girl got a message from a woman who said that she and the dentist guy matched on a dating app, they dated and then entered an "exclusive relationship," or so she thought. This new woman was suspicious because every time the guy went back home he never called or texted her, so she searched for his social media and found photos of him and his long-term girlfriend. The dentist girlfriend dumped his cheating a**. That's the end of the story of the only couple in my class.