- She neglects you publicly
Sometimes a woman's interest is caught by a passerby, a friend from college, an old colleague from work or an old boyfriend. As a man, you don't necessarily need to be the paramount priority in her life, but you do expect to warrant enough regard not to be ignored when this sort of thing occurs. It's demeaning to watch as your girlfriend carries on a conversation with this person, while you're nervously laughing along, smiling and nodding silently because she hasn't introduced you. This shows just how low you are on her priority list.
- She lies
This is a tough one. You've just caught her in a relatively small lie, maybe she didn't go to the gym like she said she did and instead went for a drink with her friend. Maybe she broke your date due to illness, but later you find out that she was out dancing. Sure, it's just one lie about something that really doesn't affect the grand scheme of your relationship -- it's nice to think that. Unfortunately, that's not the case. If she's willing to lie on matters of such minor importance, she's probably going to lie to save face when the question is more important. Lying, no matter the reason or the outcome, should always be a deal breaker for your relationship.
- She criticizes you
Successful men need their integrity and their self-esteem intact. Believing you can do something and building the momentum to actually go and do it is by far the more difficult proposition. If your girlfriend is willing to criticize you in such a way that it cuts so deeply into such an important part of your successful psyche, then that's a definite deal breaker. You may be tempted to let the first one go, but the longer you let that sort of behavior go unchallenged, the more degraded your self-esteem will be when you let her go.