Is this considered toxic behavior?

Yes im making another post about my job. There is this girl who's been training me. Im a slow learner, and I honestly lack a lot of common sense. Especially during rushes, she'll get visibly frustrated with me. Later on she'll apologize for getting frustrated with me. She'll say something like she appreciates me, and that she'd probably have a mental breakdown without me. At first it made me feel better, but she does this pretty much every shift. I don't know if this sounds like toxic behavior? Maybe I'm the toxic one?

Is this considered toxic behavior?
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