When my fianc? Left for another country to get a high end job, his calls became less frequent. I thought it was work that kept him busy, but I found out that he was seeing someone else and professing his love for someone he had just met.
I found out after I checked his email. I don't believe in sharing your email password, but in this case I was really glad that I found out the truth. It helped me move on.
What was shocking was that I thought he was the most innocent and kindest man on earth. It was scary that I almost fell for this guy.