How to deal with boyfriend in the military

I feel really horrible that I even have these feelings because I feel so so selfish but my boyfriend of two years is about to enlist and I’m not sure how I feel about it. He’s mentioned it before a couple times but we never sat down and had a conversation about what would happen between us.

So when he told me he was enlisting and was certain about it we ended up having an argument about it. I almost feel betrayed because it’s like he’s leaving me in a way and didn’t even think to tell me about it? Almost like he just expects me to be perfectly okay no ifs or buts. I know that it is his life and I don’t want to hold him back in any way and that it is selfish of me to prevent him from pursuing his own goals just for my sake so I told him that he can go but I’m just angry that he didn’t discuss this with me.

I don’t want to be one of those military girlfriends who are stuck waiting for their partner, and not knowing where he is or about his safety would kill me. I just don’t know what to do and I feel somewhat betrayed? I love him so much and everything was perfect until this. I know that I’m being very selfish but I just need someone to tell me how to get over this so I can support him. I’m honestly heartbroken and any tips on how to deal with having a boyfriend who’s in the military would be great cause I don’t even know what I’d do once he actually goes