Infection and wound separation, I can't seem to get it to heal and it hurts so much... help. (Photo)

I'm sorry to hear about the complication you have experienced; Although understandably distressing to patients, these types of open wounds tend to heal over the course of several weeks. Sometimes, the area may look worse before it looks better. Most often, even larger open wounds have healed by the time a patient reached the two months post op mark.
These wounds go on to heal through a process of contraction where the tissues heal from the sides towards the center of the wound. Close followup with your plastic surgeon will be important; treatment regimens will vary from one practice to another.  Sometimes removal of a exposed suture and/or removal of any unhealthy tissue will expedite healing.  Also important to concentrate on a healthy diet, including good protein source.It is not unusual for patients who are experiencing complications to benefit from additional time,  instructions and reassurance from their plastic surgeons.  Ask for clarification on instructions (which may vary from one practice to another).
 
Best wishes.