Yeah I wouldn't worry too much about it man. One "cheat meal" per week isn't going to hinder progress at all. Your body is much more complex than that.
Also, you can still eat out and get food that's relatively healthy. For example, don't go to dinner at McDonalds and pound 5 Big Macs, a large fry, and a coke (obviously). Go to a nice steakhouse or a hibachi place and get steak, chicken, rice, potatoes, and vegetables. Tastes good and it's perfectly fine to eat.
And I second what pyrobatt said..you used the words "actually enjoy a meal." Maybe you didn't mean it that way, but it sounds like you need to find some recipes and foods you can eat that are healthy but that you also enjoy. It makes sticking to a diet so much easier.
I eat clean 95-98% of the time I'd say and I actually enjoy every meal, so to me it's not a "diet" at all. I'm just eating foods I like that happen to also be good for me.