How many chances??

Ok, so I know I'm pretty much at the end of my rope. In the past week, I've given the ex 3 chances to rectify the situation. Not really win me back but make it less harsh, you know. All three chances have failed. After he stood me up twice last week, I figured I would just completely give up. Then on Tuesday night at 12:30am, he calls....I didn't answer.. I am so done with the drunk phonecalls. I had a tinge of guilt and went back to sleep. I decided that I really needed him to delete my number from his phone so he didn't call whenever he decided to drink. See, he doesn't even remember the next day that he calls me. Anyway, he called me last night. He had been drinking, go figure, and he wanted me to talk to him. I was out shopping and he asked me to stop by on my way home to talk with him. I told him I would but when I leave I want to watch him delete my number from his phone. He said, "OK". Well, I get there and he doesn't answer the door so I call him. He had already went to bed..no surprise. He let me in and didn't say a word. I told him to talk and he went and laid back down in bed. I told him I was going home but before I did, where was his phone so I could delete my number. I found it on the floor and was trying to delete it when he grabbed it out of my hand and threw it across the room, bouncing it off the wall.. Surprisingly, it still worked so I continued to delete the number has he continued to tell me to go to hell... Yet again, he had the opportunity to make the situation not as bad and he, again, screwed up. You know, for him to tell me how much he loves me, he's really got a sick way of showing it. I have really tried. He said he needs help but I've heard that before and I've been there and nothing gets better. I feel really bad for him. I hope he figures out what he wants out of life and straightens up. He's already lost a great thing, I don't want him to lose anymore. Anyway, what is the number? How many chances should you give someone to make it better? You know, in NASCAR, after a wreck, they give you ONE CHANCE to get the car drivable and up to speed. If you can't do it, then you are out of the race for good. Maybe one is all.....