I am going back to the b/p cycle and I don't know how to break out of it

My bulimia started when I was 13 and during a bit more than a year I b/p multiple times a day. During high school it calmed down, but I am now in my second year of post graduate studies and it came back full force in January. I gained 3 kilos during the Christmas holidays and I haven't managed to lose them. I binge and purge something like twice a week now, not as worse as when I was 13, but still way too much compared to the calmer years when it happened almost once a month and not every month. The worse thing is after a purge, I feel horrible and just want food to appease myself. I am going to live alone for the first time in less than a month hopefully. I was thinking of trying to eat better/ less since I would be alone and would decide almost every one of my meals. I intent to eat better but not ridiculously restrictively, like at least one vegetable in every meal but not only raw carrots, letting myself follow friends to a bakery without buying three pastries for myself, etc. The thing is, I'm terrified of falling full force into a cycle once I live alone, since I could technically purge "in peace". I really want to have a normal relationship to food, to be able to eat my dinner and nothing else before sleep, to not see purge as a viable solution if I eat too much. I want to restart physical exercise regularly too, to eat normaly, to not be constantly on edge about my body ( I'm on the limit of overweight since I'm 15) If there are people who managed to overcome the cycle and who are in a better place, if not a perfect one, please give me advice. I am not against counting calories too if it can help.