Cold Feet? (MorganxReid)

After Morgan has asked Reid a serious and life changing question, Reid gives him an answer but he starts to rethink his answer soon after. Morgan is driven crazy dealing with Reids mind and changing it. They begin to fall into a dispute and things continue to go downhill from there, all from one answer and a possible change of the mind.
Why is Reid rethinking his answer?
Will they work things out?
Or is it just how it is suppose to be?
What will happen?