So, when is it too much?

So my bf of 2 and a half years has adhd. We have had some problems involving relationship intensity. Additionally he goes through things like anxiety, depression, and distraction that he says is because adhd. other than that though i can see myself possibly marrying this guy one day. the only thing is, when is blaming problems on adhd too much? what should be the line that i draw concerning unacceptable behavior with or without adhd? and also, is it ever okay to break up with someone because they have adhd? i don't want to be insensitive to his needs but i don't want him to be able to blame adhd for all of our problems. advice would be greatly appreciated