first off girl, a relationship is between TWO, when one fails is almost always BOTH who should be blamed, there are VERY FEW exceptions but most times the folt is not his or hers, if they were mature they'll sit and acknowledge "is OUR fault", on the other hand, savior complex is indeed bad, but is also not so hard to understand, see, even if it has diminished in later years, it is still veri widespread the fact that MANY (and I shall still say more than half) women have "lady in distress" mentallity and/or are waiting for a Prince Charming, so you can blame guys for trying to be said Prince even if they fail miserably, on but furthermore, even if you, and a growingh portion of female gender don't want a Prince or Hero anymore, most of you still behaves like you indeed wanted that, how, you ask? by being the "lady", the one that will always wait for the guy to make a move, the one who won't talk her mind and let the guy read you, becuase it's HIS responsability doesn't it? the one who have a man buying her gifts and always paying in dates, because that's their role, so basically, you are Rapunzel, only most of you don't throw your hair down and let the "prince" clim the tower with bare hands, if you are the ones that limit themselves to be only the response to the male stimulli, never straightforward, and the whole "is the man'¿s duty" mentallity, you look in most men's eyes a helpless woman, that had to be charm, that have to be thaught how to open up to someone, that needs to be taken care of, so they, in response to you, behave like the rescuer, except there are no real knights so often they don't know what to do,.
Finally, there are many kinds of man, and most will do what you despise the most (for what I read), claim it was your faul, and well you claim it was theirs, like I said, FEW exceptions, but very likely you were both to blame, why he blames you? perhaps for the same reason you blame him, becuase NOBODY wants to aknowledge their own faults, is painfull, is easier to blame others. After almost any break up BOTH will blame each other, but often times just let it go, if it is more often that a man will play the blame game in this situation is because, it is kind of like a father and child relationship, child is dependent, child should no go against dad, because even iof dad is horrible, is the only one taking care of you (that's why you are with him), and often, you are not doing anything for him since he is not dependent on you, just like a father would feel bad after having fed a child for 20 years, being awful if you want, but being there and the child turns 21 and goes "hate you dad, see you in hell" again, the man might be horrible, but still expects some consideration out gratefullness