How do I make myself get over him?

I have loved this guy with all my heart for years now. We have know each other almost our entire lives and I never told him until recently. We have always been great friends but I think since I told him what was on my mind he has just been using me and leading me along. He stops talking to me unless is wanting to "sext," which I really am not into, and then just stops. We used to talk all the time and now I feel like I ruined our friendship because now we talk maybe once every few months and this has gone on for OVER A YEAR! Every time I try to just forget about him I almost succeed until he texts me wanting pics or something else that is stupid and not the way we used to be...then the cycle starts all over again and I cannot take much more of this. I went an entire six months without even thinking of texting him and then he had to text me out of the blue. To make things worse, he is a Marine and I do not see him so I can talk to him face to face about this like I would want to. He was once my best friend and I already know I killed that, so now I need to know how do I weed him out of my life because this is going to keep on hurting me....I usually get over guys just fine but something about him keeps on making me come back. I just want to know how do I get rid of him? Permanently for once? I hate the idea of killing our friendship but hindsight is 20/20 nd there is nothing I can do about it now. I just need help....