אם תשקר לי עוד פעם, יהיה לי קשה להאמין לך, אפילו אם תגיד את האמת אחר כך.

Here אם means if and introduces a condition: If you lie to me again...

A useful extra note: אם can also mean whether in other contexts, but in this sentence it clearly means if.

That is a very common Hebrew-English difference.

In Hebrew, when you talk about a real future condition, you normally use the future tense after אם:

• אם תשקר לי... = if you lie to me...
• אם תגיד את האמת... = if you tell the truth...

So although English uses a present form after if, Hebrew usually uses future forms.

תשקר is second person masculine singular: you said to one male.

The same is true for תגיד.

If you were speaking to a female, you would say:

• אם תשקרי לי עוד פעם...
• אפילו אם תגידי את האמת אחר כך...

If you were speaking to more than one person:

• אם תשקרו לי עוד פעם...
• אפילו אם תגידו את האמת אחר כך...

עוד פעם means again or one more time.

In this sentence, it has the sense of again / one more time:

• אם תשקר לי עוד פעם = if you lie to me again / one more time

Yes, שוב can often mean the same thing:

• אם תשקר לי שוב...

The difference is mostly style:

• עוד פעם is very common and conversational
• שוב is also common, but can sound slightly more neutral or a bit more concise

Because it plays two different roles:

• תשקר לי = you will lie to me
• יהיה לי קשה = it will be hard for me

So the first לי is the person receiving the lie, and the second לי is the person experiencing the difficulty.

Literally, יהיה לי קשה is something like will be to me hard.

Natural English is:

• it will be hard for me

This is a very common Hebrew structure:

• קשה לי = it is hard for me
• היה לי קשה = it was hard for me
• יהיה לי קשה = it will be hard for me

So Hebrew often uses: היה / יהיה + ל־ + adjective

Because לי is not the grammatical subject. It means to me / for me.

The phrase יהיה לי קשה is an impersonal kind of construction, like English it will be hard for me. Hebrew uses יהיה in the default third person masculine singular form here.

So:

• יהיה לי קשה does not mean he will be hard to me
• it is just the normal way to say it will be hard for me

Because the verb להאמין normally takes ל־ before the person you believe.

So:

• אני מאמין לך = I believe you
• קשה לי להאמין לך = it is hard for me to believe you

That is just how this verb works in Hebrew.

A helpful contrast:

• להאמין לך = believe you
• להאמין בך = believe in you

So ל־ and ב־ give different meanings.

אפילו אם means even if.

It adds a stronger contrast:

• אפילו אם תגיד את האמת אחר כך = even if you tell the truth afterward

If you used only אם, the meaning would be weaker. אפילו אם emphasizes that trust will still be damaged, even in that case.

Yes, both are correct.

• תגיד את האמת = very natural, everyday Hebrew
• תאמר את האמת = also correct, often a bit more formal or literary

In ordinary spoken Hebrew, להגיד is extremely common, so תגיד את האמת sounds very natural.

אחר כך means afterward, later, or after that.

So:

• תגיד את האמת אחר כך = tell the truth afterward / later

Putting it at the end is very normal in Hebrew. Time expressions often come near the end of the clause, especially when they modify the whole action.

It is natural and idiomatic.

A native speaker would understand it immediately, and it sounds normal. You might also hear small variations such as:

• אם תשקר לי שוב, יהיה לי קשה להאמין לך...
• גם אם תגיד את האמת אחר כך...

But the original sentence is perfectly good Hebrew.

It has three parts:

1. אם תשקר לי עוד פעם
   = If you lie to me again

2. יהיה לי קשה להאמין לך
   = it will be hard for me to believe you

3. אפילו אם תגיד את האמת אחר כך
   = even if you tell the truth afterward

So the full logic is:

If you lie to me again, it will be hard for me to believe you, even if you tell the truth afterward.

This is a very common Hebrew pattern:

• condition with אם
• main result clause
• added contrast with אפילו אם