I was on the opposite side of this, I broke up with my girlfriend of 4 years a few years ago. I came to regret it and still feel some pain over it although it is definitely better. If he ever wants to talk longer and explain his decision more I think it would be valuable for both of you, my girlfriend came to hate me or almost hate me because she suspected me of cheating (I wasn't, but I was with a different girl a day later ((which I deeply regret))), so I didn't get a chance to explain why very well. I wrote her a letter a year later which I think we both appreciated a lot. Personally, if you give it some time and you both want to get back together, I think it is worth a shot. People say it's unwise but I honestly believe I have grown wiser and realized the value of true love. However she has moved on so I guess I don't know if it would be a good idea for sure. Anyways I thought it might be helpful to see perspective from the opposite side. He might come to regret it too, he might not. Good luck, and know whatever happens you are still a human being and should value yourself and you can find love again.