To dream about your ex-boyfriend/girlfriend or that you and your ex got back together again, suggests that something or someone in your current life that is bringing out similar feelings you felt during the relationship with your ex. The dream may be a way of alerting you to the same or similar behavior in a current relationship. What you learn from that previous relationship may need to be applied to the present one so that you do no repeat the same mistake. Alternatively, past lovers often highlight the positive experiences you had with that person.�It could also signify aspects of yourself that you have x'd out or neglected.
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It will do, Dreams can be good or bad.
They can make you actually take time out and think. xD

My opinion, Forget about it.
It's just a dream and dreams reflex on what you once had or think you need. :)