Most Helpful Guy
The party that didn't cheat will most likely feel like it is. The party that's cheating will most likely feel guilty even if they don't need to feel that way. Curiosity strikes me: "Why? Was it worth it?"... I don't know if your (ex)boyfriend did this to you, or vice versa, but with a little mental aptitude it would have been avoidable with a 10 second phone call to say "I'm moving on, sorry for the short notice"