Más vale que no compartas el pintalabios ni el maquillaje con otra persona.

Más vale que is a fixed expression meaning something like it’s better that..., you’d better..., or it’s best not to....

In this sentence:

Más vale que no compartas...
= You’d better not share...

A few useful points:

• Más vale literally comes from valer (to be worth), but here it works as an idiomatic warning or recommendation.
• It often sounds a bit stronger than a simple suggestion.
• It is commonly followed by que + subjunctive.

Examples:

• Más vale que descanses. = You’d better rest.
• Más vale que no vayas. = You’d better not go.

Because más vale que normally triggers the subjunctive.

So:

• compartes = present indicative
• compartas = present subjunctive

The sentence is not just stating a fact; it is giving advice or a warning. In Spanish, that kind of meaning often uses the subjunctive after certain expressions, and más vale que is one of them.

Conjugation of compartir in the present subjunctive:

• yo comparta
• tú compartas
• él/ella/usted comparta
• nosotros compartamos
• vosotros compartáis
• ellos/ustedes compartan

Here it is compartas because the implied subject is tú.

This is a very common Spanish pattern.

The sentence says:

no compartas el pintalabios ni el maquillaje

When Spanish has a negative verb, ni is used to mean nor / or ... either.

So the structure is:

• no + verb + X ni Y

That means:

• don’t share X or Y
• literally, don’t share X nor Y

Examples:

• No tengo hermanos ni hermanas. = I don’t have brothers or sisters.
• No quiero café ni té. = I don’t want coffee or tea.

So ni here is completely natural after no compartas.

Spanish often uses the definite article (el, la, los, las) where English would use no article at all.

Here, el pintalabios and el maquillaje are being used in a general sense:

• el pintalabios = lipstick, in general
• el maquillaje = makeup, in general

English often says:

• don’t share lipstick or makeup

But Spanish commonly says:

• no compartas el pintalabios ni el maquillaje

This does not necessarily mean one specific lipstick and one specific makeup item. It can still be a general statement.

The verb compartir is commonly used with con when you say with whom something is shared.

So:

• compartir algo con alguien = to share something with someone

Examples:

• Compartí mi comida con mi hermano. = I shared my food with my brother.
• No compartas tu vaso con nadie. = Don’t share your glass with anyone.

In the sentence:

con otra persona = with another person

That part tells us who you should not share it with.

Yes, pintalabios is a very normal word in Spain for lipstick.

A few notes:

• pintalabios is masculine: el pintalabios
• It can refer to lipstick in general or to a lipstick product

In other Spanish-speaking countries, you may also hear:

• labial
• barra de labios

In Spain, pintalabios is very common and natural.

Otra persona means another person and sounds a bit more explicit or concrete.

So:

• con otra persona = with another person

The sentence is focusing on the idea of not sharing these items with anyone else.

Other possibilities are possible, but they feel slightly different:

• con nadie = with nobody / with anyone
  Example: No compartas el pintalabios con nadie.
• con alguien = with someone
  Usually not used in a negative warning like this in the same way

So con otra persona is a clear, natural way to say with someone else.

It sounds natural and slightly cautionary. It is stronger than a mild suggestion, but not as harsh as a command in some contexts.

Compare:

• No compartas el pintalabios...
  Direct command: Don’t share the lipstick...
• Es mejor que no compartas el pintalabios...
  Softer: It’s better if you don’t share...
• Más vale que no compartas el pintalabios...
  Strong advice / warning: You’d better not share...

So más vale que often suggests:

• this is the wiser thing to do
• there may be consequences if you ignore the advice

Usually maquillaje here means makeup in a general sense.

Unlike English, where makeup is already an uncountable noun, Spanish often still uses the article:

• el maquillaje

In context, it can refer broadly to makeup products, especially ones you put on the face and should not share for hygiene reasons.

So in this sentence:

• el pintalabios = lipstick
• el maquillaje = makeup

Even though both have el, they are not necessarily referring to just one specific item each. The meaning is general.

Yes. The verb form changes depending on who is being addressed.

Current sentence:

• Más vale que no compartas... = informal singular (tú)

Other versions:

• Más vale que no comparta... = formal singular (usted)
• Más vale que no compartáis... = informal plural in Spain (vosotros)
• Más vale que no compartan... = plural formal, or plural in many Latin American varieties (ustedes)

So the grammar stays the same, but the subjunctive form changes to match the subject.