Même quand nous nous disputons, nous finissons par nous parler de nouveau l’un à l’autre.

The first nous is the subject pronoun: we.

The second nous is the reflexive pronoun that goes with the verb se disputer.

So:

• nous disputons would not be correct for this meaning
• nous nous disputons = we argue / we argue with each other

Many French pronominal verbs need both parts:

• nous nous parlons = we talk to each other
• ils se voient = they see each other
• je me souviens = I remember

In this sentence, se disputer means the people are arguing with one another.

Not really. It is a pronominal verb, and in real usage se disputer usually means to argue, to quarrel, or to have an argument.

With plural subjects like nous, it often has a reciprocal sense:

• nous nous disputons = we argue with each other

So the reflexive form does not always translate literally into English. It is just the normal French way to express this idea.

Quand means when, but même quand means even when.

So:

• quand nous nous disputons = when we argue
• même quand nous nous disputons = even when we argue

The word même adds emphasis. It shows that the statement is true despite the argument.

The present tense here expresses a general truth, habit, or what tends to happen.

So Même quand nous nous disputons does not necessarily mean right now, at this moment. It means something more like:

• even when we argue
• even when we have arguments
• even during times when we argue

French often uses the present this way, just like English does in general statements.

Finir par + infinitive is a very common French structure meaning:

• to end up doing
• to finally do
• to eventually do

So:

• nous finissons par nous parler = we end up talking to each other / we eventually speak to each other again

It suggests that something may take time, or happen after difficulty, but in the end it happens.

Other examples:

• Il finit par comprendre. = He eventually understands.
• J’ai fini par accepter. = I ended up accepting.

In nous parler, the nous is the object pronoun linked to parler à.

The verb is parler à quelqu’un = to speak to someone.

When that someone is each other / one another, French uses the pronoun:

• nous parler = to speak to each other / to speak to one another

So in nous finissons par nous parler:

• nous finissons = we end up
• nous parler = speaking to each other

This nous is not the subject; it is part of the infinitive phrase.

Because object pronouns normally come before the verb in French.

So instead of parler à nous, French uses:

• nous parler

Compare:

• Il parle à Marie. = He speaks to Marie.
• Il lui parle. = He speaks to her.
• Nous nous parlons. = We speak to each other.

With pronouns, French usually places them before the verb, not after it.

De nouveau means again or anew.

In this sentence, it means they start speaking to each other again after arguing.

So:

• nous parler de nouveau = to speak to each other again

French also often uses à nouveau or encore for again, but they are not always identical in tone or use.

Here, de nouveau works well because it suggests a return to communication after a break.

They can all mean again, but there are differences.

• de nouveau = again, anew
• à nouveau = again, once more
• encore = again / still / more, depending on context

In many sentences, de nouveau and à nouveau are very close.

Examples:

• Il a recommencé de nouveau can sound heavy or repetitive, because both parts suggest repeating.
• Nous nous parlons de nouveau = we speak to each other again

Encore is very common, but it can also mean still, so context matters:

• Il parle encore. = He is still talking. / He is talking again.

Here, de nouveau clearly means again.

Yes, it is somewhat redundant, but it is a very natural kind of emphasis in French.

• nous parler already suggests speaking to each other
• l’un à l’autre adds clarity and emphasis: to one another

So the sentence could be shorter:

• Même quand nous nous disputons, nous finissons par nous parler de nouveau.

That would still be correct.

Adding l’un à l’autre makes the reciprocal idea more explicit and often sounds a bit more expressive.

L’un à l’autre literally means the one to the other, but in natural English it means:

• to each other
• to one another

It is a reciprocal expression used when two people do something mutually.

Examples:

• Ils se regardent l’un l’autre. = They look at each other.
• Nous nous écrivons l’un à l’autre. = We write to each other.
• Elles parlent l’une à l’autre. = They speak to each other.

Because nous can refer to any group, l’un à l’autre here most naturally suggests a two-way relationship.

French chooses these forms based on whether the idea is singular pairwise or plural.

• l’un à l’autre = one to the other
• les uns aux autres = to one another, among several people

With nous, both are possible in some contexts depending on who we refers to, but l’un à l’autre is very common when the speaker is thinking of two people in particular.

So this sentence strongly suggests we, meaning two people, who argue and then start talking again.

Yes. Since the meaning has already been given to the learner, it is helpful to know that finir par can be rendered in different natural ways in English:

• Even when we argue, we eventually talk to each other again.
• Even when we argue, we end up speaking to each other again.
• Even when we argue, we finally start talking to each other again.

The exact English translation can vary, but the French structure still carries the idea of eventual resolution.

It is generally neutral and natural.

Nothing in it is especially slangy or very formal. It would work in everyday speech, writing, or conversation.

A few parts sound slightly more polished than very casual spoken French:

• de nouveau can sound a bit more literary or careful than encore
• l’un à l’autre adds a touch of emphasis and elegance

But overall, the sentence is completely normal and idiomatic.