Since you don't want to be the third wheel I will go with you!

既然你不想当电灯泡，我就跟你一块儿去吧。

You two go ahead to the movie without me,i don’t want to be a third wheel.

你们两个自己去看电影吧，我不想当电灯泡。

B: no, thank you. i'd love to but i don't want to become a third wheel.

不要了，谢谢。我是很想去，但是我可不想当人家的电灯泡！

I ' m just gonna go . i feel like a third wheel anyways.

既然你认为我是多余的，我还是离开这算了。。