Should I break up with him?

My boyfriend and I have been dating for a little over three months, but we've known each other for seven years. When we first started dating, everything was really good. He called me all the time, we talked pretty much every single day. It went from that to nothing. For the past few weeks, it hasn't felt like we're a couple. We don't talk much. We don't see each other as offer because of his new job, which doesn't bother me. What bothers me is the he used to make an effort, and now he doesn't. Last weekend, we both had three days off and we're going to spend the whole weekend together like we usually do every other weekend, and I got stood up. I went to his family cookout that he invited me to go with him, I ended up having to meet him there. I usually stay at his granny's house for the weekend we want to spend together, and he didn't show up at all until the day I was leaving. He barely talked to me, and he barely answered my messages. He didn't answer any of my calls. I just don't see how things could go from so good to so sour in a matter of weeks. And on top of all of this, he's leaving for the Marines boot camp in November. And he dropped a bomb on me, and he says that he doesn't believe in marriage and he doesn't want any kids. Even though that's a future decision, I feel like... as much as I like him, this relationship isn't going anywhere. Last night, after not talking to him for a few days, I messaged him and told him how I felt, and asked him if he wanted to be with me. He said he'd call me after he got off of work, and I never got a call. Not even a text. He's said a million of times before that he wanted to be with me and that he didn't want to break up... but why continue this? This isn't a relationship. Not the one I want to be in. I mean, I love him. I've always loved him for as long as I've known him, but it's upsetting me. And he doesn't act like he cares.
Should I break up with him?
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