How will you know if a guy is sincere and not a pretender?

Philippines
@ciades (1624)
August 20, 2007 9:51pm CST
Guys can pretend that they are inlove with you. They can pretend that they are sincere and no other want is to love you thru thick and thin. They can make you believe and they can make you trust with them. I have a friend who had a relationship with in five years to her boyfriend. She is rich and older than to her boyfriend. She was shock and can't believe of what she heard from his boyfiend mouth while making a confession to her. Unexpected and unbelievable that the man she love of all of her life just PRETENDING to her WITH IN FIVE YEARS? Oh my His an actor a very good actor! An excellent pretender. For five years? After what he promised and his planned and its suddenly change as easily as like that?!! Oh girls?!! you should becareful in choosing a right one! so what can you say? How will you know if a guy is sincere and not a pretender?