我们经常吵架。

We fight a lot.

Do you two fight? (你们吵架吗?)

Yes, we fight a lot. (嗯，我们常吵架。)

我不再爱我的妻子了。

I don't love my wife any more.

我老婆有外遇。

My wife's cheating on me. *cheat on...“在男女关系上表现的不忠”。

My wife's a two-timer.

My wife's secretly dating someone else.

My wife's having an affair.

我们感情不和。

We had a falling-out. *falling-out“感情不和”、“失和”。

We had a big disagreement. (我们之间意见分歧很大。)

We don't get along anymore. (我们再也不能在一起了。)

我已经改变心意了。

I've changed my mind.

I've reconsidered. (我想重新考虑。)

你变了。

You have changed.

You're not the same as before. (你和以前不一样了。)