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Promises can carry enormous weight when someone is already anxious about their future.

During exam season for this 18-year-old, she pushes herself relentlessly after her sister promises substantial help with university costs.

What she does not know is that the offer has already been withdrawn, even while she is still studying under that assumption.

Check out how it went down.

AITA for cutting off my sister after she didn’t uphold her side of a deal

I (18F) made an agreement with my older sister (23F) earlier this year.

She told me that if I put everything I had into my exams, as in truly gave it my best and worked hard, then she would help me financially with a big chunk of my university fees.

It wasn’t a random promise either. She knew how stressed I was and offered it as motivation.

I took it seriously and held onto it like a lifeline.

This promise was definitely motivating.

So I threw myself into studying.

I skipped meals, lost sleep, took extra tutoring sessions, and basically cut out everything else in my life just to focus.

The whole time, I kept telling myself that it would all be worth it because she had my back.

She thought her sister would bring it up again.

After my exams, I found it weird that she didn’t bring it up at all. She never asked how they went or talked about anything financial.

I didn’t want to seem ungrateful or pressure her, so I waited.

Months passed.

Then just recently, I asked her about it.

Her sister changed her mind.

She told me that she wasn’t going to help anymore, and not only that, but she had already decided this back in June while I was still doing my exams.

She didn’t tell me because she didn’t want me to “lose my motivation.”

I feel absolutely crushed. I trusted her completely.

I did all of this partly for myself, but a huge part of me pushed through because I believed she’d be there at the end of it.

She let me believe in something that wasn’t real and then pulled the rug out from under me.

She’s not sure if she can even go to college now.

Now I don’t even want to talk to her. I’m too hurt.

I don’t want to be around my family either because they think I’m overreacting and that I should just “move on.”

But university is insanely expensive and I genuinely don’t know if I’ll be able to go now.

So AITA for not wanting anything to do with her after this?

Her sister was wrong to break her promise.

Granted, it sounds like the promise was very motivational, but if she can’t afford to go to school, what was the point of trying so hard?

Let’s see how Reddit reacted to this story.

Her sister never had to make that promise.

Lying is not okay.

Maybe she would qualify for a scholarship.

This person describes what her sister did as “a cruel joke.”

Another person suggests giving her sister a taste of her own medicine.

If you enjoyed this story, check out this post about a niece who takes down her aunt’s legacy after she steals her entire inheritance.

This person also likes the idea of revenge.

Her sister admitted she had changed her mind during the exams but deliberately stayed quiet so OP would keep working toward the promised reward.

That left OP feeling manipulated and uncertain whether university was still financially possible, while her family pushed her to simply move past it.

Changing the deal was one thing; letting her keep studying for a promise already gone was another.