In my opinion, high maintenance is someone who has to have everything their way. Like at work, they have to be the best and if something doesn't go the way they would like it to, they let you know. In a relationship, they complain until they get every last thing they want and they have to make sure their relationship is flawless. A high maintenance person is never happy with what they have and they always want more than they can get. (I hope all of this makes sense.)
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