
It seems that the poem is answering a previous statement of telling the speaker that he's more selfish than Arnold, as the opening line is "Oh, no one can deny that Arnold is less selfish than I". This statement seems sarcastic, particularly because of the "oh" at the beginning making it informal. It's suggested that Arnold is considered less selfish than the speaker because he has a wife and family whereas presumably the speaker only has to look after himself. Arnold "married a woman to stop her getting away" but "now she's there all day" these two are extremes, all or nothing but neither seems to be portrayed as positive. Before, the "woman" was getting away, showing freedom, yet marriage has stopped her from doing that, suggesting that the speaker thinks marriages are traps. Arnold's wife being called "woman" seems a bit distant, rather than being called by her name, perhaps suggesting the speaker thinks the situation would be the same with Arnold and any woman, generalising woman implying they're no different to one another also seems sexist.
It's suggested that the speaker thinks following the tradition of getting married and making a family is "wasting...life". Arnold's wife "takes (his money) as her perk" suggesting that she's selfish, but also that Arnold is providing for his whole family, not just himself, so he has to share everything he works for, unlike the speaker. The "kiddies' clobber" is portrayed as unnecessary by the speaker, implying again, a negative opinion of marriage and having children.

The speaker shows how Arnold may feel obliged to welcome "her mother" to "come for the summer" suggesting that marriage is stressful and pressured, as well as being repetitive and boring, creating an undesirable image of marriage.The speaker almost started to feel guilt when he "compare(d)" Arnold's and his life, making him feel like a "swine" because he thinks his life is so much better and sympathises for Arnold because of being trapped in a marriage.
However, in the sixth stanza the speaker has a change of heart and decides that Arnold is in fact selfish as " he was out for his own ends". The speaker starts to decide that there isn't such a "contrast" between him and Arnold, suggesting they're both equally as selfish because they both chose to have their life that way.
