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The first milestone in a relationship is when the partners agree to 'go steady' - to stop seeing other people. This is a commitment because it says you are no longer going to actively look for other alternatives ... that you feel your current partner is worth working on seriously to see if things can work.
Be sure that you are ready for this step. If you go into it thinking, "I can try it for a week, but if I see someone else better I'm out of here" then it won't work. You either need to commit to trying an exclusive relationship, or you should stay open until you find someone with who you *do* with to commit.
If you commit but don't expect it has any real chance of working, or with the option of bagging out immediately if something better comes along, then you are misleading your partner and will end up hurting him or her.