Because they're not getting what they wan't from you & think it's all good to mess around,& that at some point they'll get something they wan't from you...I don't even get why people cheat...I been through this,
Because they have no pride in themselves. They are disgusting, immoral and untrustworthy. I don't know if they just don't believe in themselves or they were raised by a whore mother. Either way they're pathetic and a waste of space.