There are many girls in our batch do the same. I remember one person came to campus and tried to suicide in front of the campus gate since his girlfriend started an affair with a senior.
Another girl had an affair with a senior. When senior passed out and went to a job, she started dating another guy from our own batch. That senior didn't know that and at the end of the day married the same girl. I went to her wedding and her secret lover, one of my friends, with me in the same party. He showed me some messages from his phone which were sent by the bride last night. He told me don't trust girls.
There are many other affairs broke after the campus life. Most of them were get together for whole 4 years and after started employment they went on separate paths. Some cases are unbelievable.