This specific example sounds like codependency.

You can't put a number of times someone betrays you as a definitive point between where everything is normal, and it is not, but a general rule of thumb I have is that if you have to ask the question, it's probably too many times (yes, even if that number is 1). If someone has been betrayed and lied to multiple times, and returns to have it happen again, they need to realize that their "love" for this person is not a love of that person, but a love of the ideal "person" that is nothing like the betraying, lying jerk that is not worthy of your time.

Sometimes, I've found that some people seem to focus so much on an idealized version of their partner that they don't have the faintest idea who they're even in "love" with is.
Source(s):
http://www.nmha.org/go/codependency

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You can forgive as many times as you want to. I don't think there is a point at which you can't, unless it's something that causes much damage and physical harm, especially to third parties, like because of their actions you end up homeless with kids.

But if you truly want the best for them (the definition often left out of what love is), you have to ask yourself why is it they keep being untrustworthy and unfaithful? Perhaps they're having a hard time accepting that they really don't want to be in the relationship.

If they're going to continue the untrustworthy behavior, I'd say that no matter how many times you forgive them, they're going to continue to do things to betray you. It's a downhill spiral if they are never taking any initiative to fix their behavior and the relationship.

And just because of that, I'd end it. You can still forgive them, but that doesn't mean putting yourself in the position to be hurt again.
Source(s):
personal experience, including being engaged to someone who started dating someone else 3 months before the wedding. The wedding never happened and I've been married 22 years to someone else.

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Fool me once, shame on you. Fool me twice, shame on me.

As long as you are her/his puppy, she/he will never respect you.
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Three
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Your heart is never unfixable but you may wonder why you would like to be with someone who breaks your heart. There are plenty of people all over the world who will give you love, why choose someone who will not?
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Once. my friend, only once.
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If you are being true to your self, and not masochistic, to maintain high self esteem ONCE. If someone really has those feelings for you, then unless your definition of a broken heart is consistent with a "soap opera" standard, then that should be it
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No matter what anyone tells you, relationships consists of games and thus are work. This makes perfect sense if you realize that anything in life that is worth anything, isn't easy.

That being said I came up with a rule many many years ago, which is; Be willing to walk away, or be willing to dragged behind.

It sounds to me that you are so forgiving that you get dragged behind.
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I'm done after my first time. After that, I'm looking at her through the corner of my eye, if I even tolerate her again. That's my philosophy.
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When you get tired of getting your heart broken you will walk away. The question should be: How much abuse can you take?
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