4 Gan her admire, and her sad sorrows rue,
Gan > did
5 Blaming Fortune, which such troubles threw,
threw > prepared, threw [in Una's way]
6 And joyed to make proof of its cruelty
joyed > rejoiced, took pleasure
7 On gentle dame, so hurtless, and so true:
gentle > gentle; noble hurtless > harmless
8 Thenceforth he kept her goodly company,
kept her goodly company > [courteously kept her company; or: remained in her courteous company]