Should I break up with my boyfriend...?

So I guess it's come to the point where I'm so indecisive that I have to ask strangers for opinions🙃 My boyfriend and I have been together for around 3 years (broke up once in between) long distance (not too far though). He SUCKS with his phone and will take hours to respond to me. He'll promise to call or text me, but then doesn't. I normally have to text him first now. This has been a problem on and off (and was the reason we broke up the first time) but hadn't been really bothering me up until this month. Now I just feel like I'm mad at him more days than I'm not and he just keeps telling me that he's content with how much we talk and that if I'm not then it's not really his fault. I've talked to him about this so many times and I'm so fed up. I told him I needed to talk to him later and he goes "ok well I'm gonna go play Pokémon go ttyl"... HOW OLD ARE YOU?? I'm literally fuming but I don't want to throw away 3 years worth of a relationship over something this stupid. I can't imagine life without him, and the distance ends next year. Should I really consider starting to break up with Jim.

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