Me and my ex we dating almost 6 months and they were great, but he has an issue were he doesn't check his phone at all. So its hard to make plans. When he does check his phone he always texts others back, and he waits till after 9pm to text me.. . like are you kidding me? He has done this for the past 4 months, and I'm tired of it. Was I wrong to break up with him?

Hell no you were not wrong to dump a guy who could get his act together and at least treat you as good as he does his friends.

Where there other issues!

Did you ever ask him why he does this?

Some more details would be helpful.

It's strange.I don't really think you were wrong to break up with me.At least the thing which he'd been doing was quite annoying.Have you ever asked him why he acted like that?
I'd think that he didn't appreciate your time and moreover relationship with you.