He should not be able to sue you there is no lawsuit for "alienation of affection" or otherwise for having an affair with a married woman, in D.C. The law does not recognize grounds to sue someone for this.
However, if he brings a divorce action, you can and presumably will be a witness, and can be deposed, can be forced to testify, etc.
So you should not need an attorney to protect your own interests, but do expect that you will likely be a witness in court.
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