How did your lips react after you stopped applying the product?
Maybe it was some sort of allergic reaction, which is a shame really.
Not the end of the world though, I'm sure there are similar products that create waterproof invisible barriers such as this.
Just an update - Haven't been using this product for a while cos I can't stay strict. I was getting frustrated how I kept f***ing up, so I'm sticking to aquaphor atm to enjoy life for a bit, then when I get extended periods of free time I'll switch back to GIAB and be strict. But remember, if you cant be 100% strict don't bother trying this method until you can.