Military girlfriend advice please

Vivica

So my boyfriend is trying to enlist in the army and he’s already qualified on the asvab. I’m trying to be supportive but the thing is I can’t handle him being gone. I literally am so clingy to this guy. I can’t go a couple days without seeing him so can you imagine 14 weeks!! I don’t know what to do bc I’ve tried telling him how I feel and he always just tells me to calm down and he’s not leaving yet. I have major abandonment issues bc of previous relationships. How do I get through this I literally am in love with this man but he is leaving and I know its for a short time but I can’t do long distance without talking to him or getting to see him. The thought makes me sick of him leaving. I cry every time I think about it. How do I tell him to stay or make myself happy with his decision even when he’ll be gone??