your ex is an ex for a reason. if he gets you back he will behave for a few months and go back to normal.
i've seen it over and over again.
Ummmm, take the other guy and leave your ex behind you. They always say they will change but never do.
Losers are always very adept with excuses. They've had a lot of practice in life. The best thing you can do for him is buy him a Yoda t-shirt with the quote,"Try not. Do or do not, there is no try." The next day break up with his lame ***.
Its always the same, they never know what they really have till its truly gone, forever.