Obviously there isn't a one size fits all answer for the question: "What's the most unattractive quality a person can have?", but I think my personal pick has to be high on the list. It has nothing to do with physical appearance. Don't get me wrong, obviously the physical stuff has to click, but for me there is something that makes even the biggest genetic lottery winners seem ugly: insecurity.

Insecurity can manifest itself in different ways, but that controlling, jealous, possessiveness is the worst. If you can't trust the person you are with to be out of your sight, either you have a problem or they do - either way, you probably shouldn't be a couple.

If you are single this Valentine's Day, but not by choice, perhaps you should do a little soul searching and see if you're "one of those people."

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