DON'T: Go out every night partying with your friends while your partner sits at home.
Do we really have to explain why this is important? And yet, you'd be surprised at how many guys just can't give up going out regularly with their friends and how many ladies are still lined up every week for ladies' night. If you want to do that, that's fine. But, don't expect your relationship to grow. Everyone needs to go out sometimes, but you also need to set aside plenty of time for your significant other.