As a start, it may help to understand that a relationship breakup is a loss just as is the death of someone close, in that we respond to it in the same way, according to the widely accepted "Five Stages of Grief"

These are just guides, the stages don't come in any particular order, and some people dwell on a particular stage for a long time while others do the whole thing very quickly. I can help to identify what stage you feel you might be in but mostly it might help to recognize and accept that what you are going through is truly a grieving process and that it is normal for people breaking up. Two years ago a loss of an almost-relationship triggered this in me and was a very large contribuiting factor to my current depression.

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