Johnny seems to be regretting decisions he made being a product of his upbringing ("could have had the cadillac" and "could have married Anne") and as a result, taking revenge out on his wife. There's such a personal story behind each individual who abuses, and the victim too.
I didn't like this song at first because of the themes of domestic violence (found it a bit disturbing), but I like how Johnny is going to be unhappy for the rest of his life because of the choice he made. Poor Johnny...LOL. Nicely-told, Mr. Bowie.