Should my wound be wide open 2 weeks after surgery? Partial mastectomy ... I see the stitches (Photo)

From the look of your pictures, this is certainly not a typical healing result at 2 weeks after surgery. It looks as though you have either a wound infection or skin necrosis. I would suggest that you get in contact with the breast surgeon that performed your surgery as soon as possible as this needs attention from qualified medical professionals. 

I'm so sorry you are struggling with this! Yes, I would work to clear out infected tissue and attempt to re-close the wound primarily as that will be the best way to achieve an even, normal looking breast and small scar. Did you have multiple surgeries to clear margins? Was there any attempt to remove fluid or infection with ultrasound guidance? I find that the most helpful and have had much success at preventing re-operation. 

Your wound healing is not normal.  I hope that you've been back to see your plastic surgeon about it.  If you've had radiation to that breast, that may account for some of these troubles.  Or it could just be infection that caused it.  Either way, best to be evaluated by your surgeon quickly.