I don't want to be the third wheel.
我不想当电灯泡。

I am a one-woman kind of man.
我是那种从一而终的男人。

Those boys like to hit on me all the time.
那些男生老爱找我搭讪。

That's the long distance relationship.
我们是异地恋。

I saw you smooching with that girl just outside my window.
我看到你在我家窗外亲那个女孩了。

Are you trying to seduce me?
你想勾引我吗？

I'm over you.
我跟你之间完了。

You should have chivalry.
你应该有点绅士风度。

He is dating another girl on the side.
他脚踏两条船。