who else does that

I have two friends who recently got broken with their boyfriends. One of them was cheating another one was 'no reason'. I don't know how much that hurt, but it seems like a lot of damage. They can't stop crying. The 'no reason' one was my roommate, and her boyfriend was gone to far away (16 hours to flight) for his new job, and after she sent all his stuff and finally, right after she sent his honda accord, he said something like 'we are not meant to be together, we are heading different direction'. Then what about all those times? They were together for over 3 years!! And another one, cheating, was more freaking. They were together for a year, and the guy was seeing another girl for 10 months at the same time. He said that he love her every night, and he was SO sweet to her. Who does that? It will be hard for those poor girls to meet somebody else. I keep tell them to forget what happened and move on, but it seems like it's really difficult for them to move on. I think there can't be a single reasonable excuse for those guys. What they have done to my friends is a crime.