Why?

I really feel sad... Why men can't be honest? Why? Is it a genetic question?

Why can't they say the truth even when they're in love with a women?... Why can't they resist other women even if they're satisfied with their wives why?

And why some women can't respect? Why do they say things they're not supposed to say to men they don't know good? Whey can't they keep some limits?

Someone to answer my questions?