I'd say Trust and Communication are the big biggies, as loads of people here have already said.
In the long run there's gonna be times you cant know things for sure and have to take their word, and they yours. Much easier if you can both do that unthinkingly.
Share openly and often - dont even get into a relationship with someone you dont see as your best friend also, and you should be fine.
You make your luck in the love game by choosing right in the first place.
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If you always do what you've always done, you'll always get what you've always gotten
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