Sentence:  Liam hadn't meant for that last part to slip out. Allie might think it pretty pathetic that he'd remembered that comment from the first night they met, but it had <WSD>rankled</WSD> him then and, to some degree, it <WSD>rankled</WSD> him now. 
Meaning of the word marked with <WSD> tags:  To cause irritation or deep bitterness.