Expectations hurt the most. Expectations in love, expectations in life, expectations with (from) people etc. Root cause of all sufferings is attachment to the expectation. Its dependence on things, events and people for your happiness.
If you love, don’t expect. If you expect don’t love.
A word of caution : Don’t jump into unrealistic conclusions with these statements. World is cunning and cruel. Test people, let them reveal their true colors and only then love unconditionally. People make a great mistake by loving people unconditionally even before relationship begins. All the above statements are useful only after love has established. Till then ‘Happy mind gaming!’.