The older I get, the more I live by the old adage, "Fool me once, shame on you. Fool me twice, shame on me." If someone does something that really stings, and I know that they will keep doing it (both to me and to others), I try my best to tell God it's in His hands, and unless God seems to be telling me otherwise, I move on to a life without that person.
I guess that's the best thing that came out of my ex-husband leaving and never looking back or changing his mind. At the time, I thought I was going to die, but now I feel blessed that he didn't try to hang on to me because I would have looked the other way, always hoping he would leave the other woman and just choose me. This taught me that no matter how much I think I need a person, if they're purposely doing something that makes me feel like I'm dying, I can live without them.
I do struggle with the fact that Jesus told His followers to forgive "70 x 7" (symbolizing an infinite number of times, just as God forgives us), but I no longer believe that this means we have to keep in close contact, or have any contact at all, with people we know are going to serially hurt us over and over again.
This may also be the best part of being an introvert (who can masquerade as an extrovert when needed)--I've cut a lot of people out of my life the past few years, and to be honest, I've never felt better.
I also understand that people might feel the same way about me, too, so if it's just my personality and not something I'm doing wrong (because if I'm doing something wrong, I want to correct it), I'd rather we just wish each other the best in peace and go our separate ways rather than try to keep on a facade that we both know isn't working.