He's pretty much telling you to stand up for yourself once the cheating happened. After the second time she cheated on you that should have been a hint that things weren't going to work out...Especially with the short ammount of time between the cheatings. It partially is your fault you let it go on like this, you should have ended the relationship then and there (Although it isn't your fault that she chose to cheat). Hope I explained it right.
For me, I draw the line at one. It'd be extremely rare for me to accept the relationship after that (Probably based on the length of time we are together).
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