My boyfriend (with whom I am in a ldr atm) has stopped putting an effort. When I suggest breaking up, why does he refuse it?

I've tried ignoring him completely a couple of times and he reaches out until I respond. I told him yesterday that if he doesn't change I'm gonna move on, and he said that he gets me and will sort it out. But he was supposed to text me after landing (he flew back home) last night and he didn't, found an excuse in the morning (put my phone on charge and fell asleep).
My boyfriend (with whom I am in a ldr atm) has stopped putting an effort. When I suggest breaking up, why does he refuse it?
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