Yah its not how many chances you give a person, its how much crap you can really take from one person. Everything usually comes in three though. If they cheat then just dump them straight up! Once a cheater, always a cheater!
If they lie about something then just ask them if they do really love you enough to not lie again. Everyone has secrets so you try to tell a lie from a secret apart.
Now if they flat out just hit you, then get away cause its always bad. And its always gonna be bad. Plus you just get stuck in a relationship with someone that you love and hate at the same time. Then rules are involved and neither one of you have the freedom that you want and deserve. Its just best if you get out A.S.A.P.!!! 
Now ask yourself this............. How much crap do i have to deal with and how much time do i have to waste before i finally let this person go? Is this person really worth it? If your asking yourself this question then 85% of the time they aren't worth it and you find yourself in a rut ten years later wondering why you did what you did and where you went wrong.You decide and write me back and let me know. PLEASE!