Angelakos could be saying that he got married just to keep him grounded and mentally sane.
Alternatively, he could be saying that he’s thankful that he’s “got somebody else”, as he feels that he is more settled and calm with her.
The “keep me on my toes” line could refer to the feeling that, when you are in a relationship, you always try to keep on your toes and not hurt your significant other, with Angelakos saying that this focus has almost kept his Bipolar Disorder in check