That's surprisingly deep and accurate psychologically for a shoujo manga no less. The author actually correctly recognized the psychological effects of a mother that sees her son as an "ally" - either becoming totally dependent or going to the other extreme. It's refreshing seeing something like this. The mother is obviously projecting her husband's image onto her son, and I am fairly certain that he's doing the same with the girls he's dating (though maybe not intentionally), using them as a tool to get "revenge" on his mother.