The motor in my car caught on fire, mechanic says its ok to drive .. Help !!?

I called a mechanic after my car started leaking gas while I was driving , I don t know how that happened , I was turning onto a street and it started smelling a lot like gas, I made it home and when I got out of the car I saw a big puddle of gas 🙁 the car didn t turn on after that , so the mechanic shows up and I don t understand what he was doing but my motor caught on fire !!!! He says its ok to drive it but I m very scared , what now?

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