Would It Be Alright To Eat One Scoop Of Ice Cream Every Night?

I'm 18 and I've tried to adopt a healthy diet over the past year, but I'm starting to feel a bit deprived. I eat healthy all the time, and frankly, it's starting to feel a bit bland, especially when I see friends eating really tasty food and feeling like I can't eat it because I'll gain back the weight I've lost. I've been thinking of letting myself eat just one scoop of ice cream every night or every other night. And it wouldn't be any more - I'm very good with portion control. Would I gain weight if I did this or would it be alright? I also exercise 6 days a week.