10kg(22lbs) in 30 days means calorie deficit of 2566 calories per day. Not possible unless you stop eating entirely.
You can work your abs every day but you cannot spot reduce, fat is lost evenly all over the body.
How tall are you? 84 kg is not really that much and trying to lose 125 of your weight is really substantial.
You can't really safely lose more than .5-1kg per week.
Does this girl know what you look like? You say she's a girlfriend but acting like it's a blind date.
"To give anything less than your best is to sacrifice the Gift."