I've behaved selfishly with my wife.我在妻子面前表现得十分自私。

Selfishly, I had not considered how my death would affect her.我很自私, 没有考虑过我的死会对她造成怎样的影响。

Selfishly, I worry that people will think I did it.从我个人的角度, 我担心人们会认为这件事是我做的。