Hehe, I am a bit more cynical at present. I've been listening to lots of Dan Savage and the "dump the motherfucker already."
If he genuinely just fucked up and wants to make it right, that's a good thing, for sure. I've just seen so many people, not just men, treating their partners like shit, not caring and seeking out whomever they please for their own consumption. And if that is the case... run for the hills! And I agree with Indie that the time of his relationships doesn't necessarily mean much. Look at what happened during them. How they ended, started, went... If he is someone who dates then during that relationship meets someone else. And does that over and over. Dumping people for someone then dumping that someone for someone. That, to me, is a toxic pattern. Maybe tell us a bit more about what's going on?