And now I feel like a jerk for even saying that.

我连说出来都觉得自己是个混蛋
Look, sometimes somebody has to lose out.

听着有时候总有人得吃亏
In this case, it's me.

这次吃亏的就是我
To promise.

承诺的定义是
Defined as "A declaration or assurance

一个人对某项事务
that one will do a particular thing or a particular thing will happen."

答应照办或实现的声明或保证
Thank you, Annie. I know what a promise is.

谢谢安妮我知道什么是承诺
Oh, really? So what happened to our promise

是吗那我们的承诺算什么
not to get involved with Mark's life?

不是说好不干涉马克的生活吗
You lied to me!

你竟然骗我
No, you said it wasn't worth arguing about,

你说那不值得一吵
and it was Mark's decision, to which I agreed.

而且那是马克的决定只不过我同意罢了