Please help ladies, I’m struggling with this

Sooo a few months ago I decided to change my lifestyle. I began eating extremely healthy and working out 5 times a week. I have not had a single cheat day and I’ve lost 30 lbs. I’m so happy but I still have 20 more to go to get to my goal. The problem I’m having is that I’m terrified of gaining weight back. Tomorrow my boyfriend and I are planning to get a fish fry, it comes with 2 pieces of fried battered fish, potato wedges and bread. I don’t want to be “that” person that goes to the meal and gets healthy food, I WANT to be able to enjoy this with him, but I’m so scared of ruining my progress. I know it’s irrational and I won’t but it’s all I’ve been thinking about. Stressing about finally having a cheat day. I calculated that I’ll be eating 2300 calories tomorrow compared to my normal 1300 and it’s terrifying me. Can anyone give me a little reassurance and is it normal to feel this way?? Should I get the food??