Which qualities do you look for potebtail BF/GF/ life time partner?

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There are two greatest that each person may face in life. One is choosing the right career and second is choosing a life time partner. We should be careful in making right decision as far as these two big deals in our life are concerned. But sometimes even how careful we are in choosing we still end up regretting. Would you think it has something to do with standard we set in choosing? Now my question is this-- Which qualities do you look for potential BF/GF or life time partner? and why?