Being dishonest, cheating, no longer wanting the same things, verbal & physical abuse, lack of sex, being taken advantage of financially over and over again, loving gestures and consideration are a "one way street", placing you in harm's way by associating with criminal types or participating in illegal activities, constant disagreements, and last but not least, realizing the person you are with is NOT the person they pretended to be in order to win you over!
Truth be told only YOU can decide what YOUR "deal breakers" are. If you find that you are are in a relationship where you are unhappy more often than not, it's time to consider whether or not you would be better off moving on. We choose our own friends, lovers, and spouse. You are responsible for your own happiness!