Of course it was much easier for Frenchmen to do these things; the language was such an aid; Philip could never help feeling that to say passionate things in English sounded a little absurd. He wished now that he had never undertaken the siege of Miss Wilkinson's virtue; the first fortnight had been so jolly, and now he was wretched; but he was determined not to give in, he would never respect himself again if he did, and he made up his mind irrevocably that the next night he would kiss her without fail.
Of Human Bondage by W. Somerset Maugham
Can you paraphrase the bold sentence for me?