Ending an engagement?

[subrina k]

My fiance and I have been together for over a year. We were boyfriend and girlfriend for about seven months. He moved to New Mexico for a job. We would talk all day everyday. One day he all of a sudden stopped talking to me. I was getting suspicious maybe he found someone out there. I also found out that he made a profile on a dating site. I had the password for his Facebook profile and I went on it. He found out and he broke up with me. Is there any hope that I can get him back? Would you break up if your significant other went on your facebook?
Is going on Facebook grounds to end an engagement? He moved for work. I also found out by going on his Facebook that he was talking to his ex girlfriend.