Struggling with caloric deficit

Every time i am in caloric deficit, I end up over eating within 5-7 days. I have learnt a lot, i am woman of 162 cm and weight of 64, i am eating around 1500-1600 and I am still hungry, I aim for 100-120 g protein per day, i keep one sweet a day and try to make balanced meals. This weekend there was a party and i had pizza as there was no other food, Ok. I said to myselr i will continue, next day we were invited to eat fries. The reason why I never decline those evenings anymore as in the past i lost 10 kg but I also got eating disorder when I would avoid all events and isolate myself from whole world so I wouldn’t overeat and could keep to my program, I had big success and I had little carbs and mainly protein with vegetables. I thought of doing it again but idea of avoiding social events is making me worried and also i work and have a kid, so it would be no flexibility and hard to maintain
My question to you, what was for you the life changers that helped you to stay on caloric deficit for months?