People do so because they are driven by the whiplash of desire. It is not a question of better option, – after all how does even decide what is better when all that one is looking for is instant gratification and transient pleasures. It is simply the sign of a restless mind with no deeper values. If such people leave and go away for so called better options then one should be thankful to the Grace that one was made to see the reality behind the facade, the calculating mind behind the mask of love.
Affectionately,
Alok Da