What he just said. Here's a little analogy for you.
I was in charge of renting a particular property for a mgmt company and was going through a long list of potential tenants. I got an app and he didn't list his current landlord's phone #. With a little prodding, I managed to get it. He'd only been there 3 months which was a little suspicious already. His LL calls me back and I mention the name of this guy who's moving out and the landlord sounds surprised. The guy hadn't bothered to give his current LL notice (30 days is standard) and was planning to ditch him, possibly owing some rent, and leaving him with no time to find new tenants and leaving the property vacant for a while. I can't help but wonder if he's going to do the same thing to us. His app got rejected.
Think about that when you decide to treat an X like shit, particularly with how it will look to potential future girlfriends who are deciding whether they want to give you a chance.