When I swap token but failed, I still must pay gas fee or no need to pay

I just swap token and failed, 1 time I lost $100 and I try to swap again, and I lost another $100 again. so don’t know how to do. and very sorry about my poor in english.

Hopefully this video helps. Make sure to not change the gas limit, and it’s recommended you pick the “fast” or “fastest” option on metamask.

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Thank you for this vdo

What makes the gas limit changed? I have seen that the gas limit changed from 134562 to 600000.