My girl is going to the marines. Am i cooked?

I’m sure there’s less girls in the marines then any other branch and guys will go after the few they have. She says she’s loyal and i’m trying to trust that, but you guys have any stories any advice on how to keep it going or am i just cooked. she’s doing 4 years active duty, 5’5, white, 19 years old. she’s cute. All my friends in the military say all military girls they know cheated. All of em. Do you guys have the same experience?