I'll never ever,

Was messaging with claudia during class,was talking ... Why do boy need to flirt behind their girlfriend? Why do they need to do it behind of their girlfriend, why can't them just end the relationship and continue flirt. Is girl feeling nice to play? seeing someone crying for you , the feeling very nice is it ? I sometime don't really understand, before i know him, i don't even know what is a real FLIRTER,seriously.