It can be anything that you believe helped in a positive way.
Most Helpful Girl
Give them all their stuff back straight away or give it to a mutual friend, it is physically and emotionally baggage
Cut off all contact for a week or two, you need space to get over the person and bring constantly in contact or seeing their facebook/twitter etc will only make things worse
Take time out to be upset and reflect, after that, take a step forward and don't go back to that phase
Be with people who make you happy, meet with your friends or spend time with your family
Continue your daily routine, don't change anything
Move on from it, maybe be friends when you both feel ready but don't live in the past
Don't rush to find someone new, let the dust settle and don't look for someone new, just enjoy some single time
Don't let it affect your future relationships
Most Helpful Guy
There are quite a few opinions on the matter, but for one things to definitely not do is find a fling. A lot of people find an immediate fling after a breakup, but it weighs on the mind too much, and sets you up for a rollercoaster of un-needed emotions.
As for what you should be doing. I recommend staying busy with friends, or family. Make sure this is done by doing things to which you know your ex will not be involved or anywhere remotely close to. Another is that you shouldn't contact them in any form, don't look their facebook page, nor old pictures, nor reach out to any of their close friends. Finally, I'd always weaken the blow of a breakup by working more, or harder at my current job. Not exactly extending my hours, but improving my conduct, and knowledge at work so I could move up the ladder. Being single is a good time to spend that extra time working to better your career.