My best friend keeps cancelling plans last minute. I don't want to lose her, but I'm tired of feeling like an option. How do I bring it up?

I have been saving money in secret to pay for my little sister's university. She thinks it's a scholarship.

My best friend moved abroad and every video call ends with both of us pretending we're not sad.

I passed the exam I was sure I failed. I cried in the parking lot for twenty minutes. Happy tears for once.