Remove the Drama
Drama associated with an ex can stem from associates in your social circle, items left behind, or perhaps a coffee shop or restaurant that you regularly visit. Regardless of where the baggage is coming from, be the bigger person and remove the drama from your life.
You're probably thinking, "Why should I have to be the one who changes or gives something up?" But, in truth, you know that getting rid of drama is the only way to really move forward and abstain from future issues that could arise. Ditch associates that you met through an ex - that are really the ex's friends anyway. Try coffee or food at a different location and opt to take other measures that will alleviate the constant stress of the other.