I (18M) am in high school and I am going to ask my ex (17F) our agin because I would going to the marines to boot camp. For some context, me and my ex were dating for 3 months before she broke up with me because of her dad not letting her go out with me.  This happened last year November to be exact. Ever since then we been good friends and we got much closer. Now that i going to ship out in couple months to boot camp. I just wanted to spend time with my couple mouth here with my ex but I feel this can make me a asshole if I asked because I fear this will ruin our friendships for reminding her of our relationship. 
P.S I going to ask her today. My honest opinion she will say no 