How to deal with the chronically late boyfriend?

[MTSUGURL]

He does know it bothers me - I've definitely talked to him about it. And when I talk to him about it he improves... for about a week. Generally we drive separately because of this, because I refuse to be late because of him if our plans include other people. The other day when he was nearly two hours late, I called him and asked if he had forgotten our plans. Not only had he forgotten our plans, but he had forgotten that I was off work and was actually waiting for me to call him on my lunch break. It's like there's a complete disconnect somewhere in his brain. When I told him, It's nearly 1:30 and you were supposed to be here at noon he freaked out and immediately left for my place.

On the flip side of things - this is a guy that plans surprise evenings in great detail, spends lots of time listening to me, does things like bring me ice cream when I have a bad day, wants to talk more than any man I've ever met in my life, and is just basically a sweet, intelligent, hilarious, thoughtful in ever other way man. That, and not his "pee pee" as someone so eloquently put it, is what makes him worth it. Like I said, it's not a deal breaker (partially because it's not just me he's late for,) but it is annoying.
I like the leave if he's not there solution. We'll see how that goes...